Dr. Antonio Eduardo Monteiro Horta

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Estacao Zootecnica Nacional
Animal Reproduction
DirectorAppointed: 2002

Mailing Address

Estacao Zootecnica Nacional
Vale de Santarem, P 2005-048
Portugal

Contact Information

Phone: +351-243-767406
Fax: +351-243-767307
antonio.horta@pluricanal.net
http://horta.0catch.com/aemh/

Qualifications

Ph.D., Instituto Nacional de Investigacao Agraria, 1988.
D.V.M., Technical University of Lisbon, Veterinary Medicine, 1976.

Expertise and Research Interests

My research work has been developed in the area of animal reproduction, since 1978, by taking the leadership of 10 research projects and participating as coauthor on 15 projects. Early studies concerned the role of prostaglandins (PG) on the mechanism of placental separation in the cow, and a cause effect of PG F2-alpha deficiency on placental retention was discovered. Nowadays, PG F2-alpha is successfully used to prevent placental retention provoked by a caesarean sections and induced calvings. Further studies searched for relationships between placental retention, uterine involution and the resumption of postpartum ovarian activity in dairy cows. Ovarian activity in a Portuguese local beef breed (Alentejano) was characterised throughout the year and postpartum anoestrus was also studied. The first studies on the onset of puberty in Portuguese goats (Serrana) were done. I was involved in the implementation of transferring bovine embryos totally produced in vitro (IVM-IVF) to beef cows to induce twin pregnancies for the first time in Portugal, the first live calf being born in March 1991. In cooperation with French and American teams, we succeeded in diagnosing embryo mortality and twin pregnancies by measuring the bovine pregnancy specific protein B (bPSPB). The patterns of secretion of bPSPB were also characterised in beef cows throughout pregnancy and during the postpartum period in twin suckling cows and in cows with placental retention.

Since 1993, I took the leadership of a project which succeed in producing bovine embryos from in vitro matured and fertilised bovine oocytes. The first parturitions from those embryos happened in August 1994. As supervisor of a Ph.D. thesis and coauthor on the research work done, it was recently found that a progesterone antagonist (onapristone) administered to ewes during the follicular phase, blocks fertilisation by arresting sperm in the cervix. Involved in research concerned with the role of prostaglandins on oocyte maturation, fertilisation and embryo development in vitro.

Citations

Other Expertise

Teaching on technical and postgraduate courses

Future Research

Refinement of techniques for freezing semen in ovine and caprine, cervix rippening during AI in sheep, ovine and caprine in vitro embryo production and involvement of lipids on in vitro embryo growth and freezing ability. Male effect on sheep reproductive behaviour and reproduction. Portuguese Animal Germplasm Conservation and characterisation. Sperm and embryo freezing improvement.

Industrial Relevance

Milk and beef industries, through the improvement of reproductive performance in concerned species

Keywords

COS Keywords:

Allied Health Education, Animal Reproductive Biology, Animal Science, Higher Education, Puberty, Veterinary Medicine.

Additional Terms:

Cattle, In Vitro Fertilisation, Placental Retention, Postpartum Anoestrus, Prostaglandin, Puberty.

Languages

(Reading, Writing, Speaking)

Portuguese: (Fluent, Fluent, Fluent)
Spanish: (Fluent, Functional, Fluent)
English: (Fluent, Functional, Functional)
French: (Fluent, Functional, Functional)

Memberships

International Congresses of Animal Reproduction
Ordem dos Médicos Veterinários
Portuguese Society of Animal Reproduction
Portuguese Society of Veterinary Sciences
Sindicato Nacional dos Médicos Veterinarios

Honors and Awards

1997, Premio Pfizer de Veterinária, Pfizer, Sociedade Portuguesa de Ciencias Veterinarias, Scientific paper on the luteotrophic effect of bovine embryos and different sera supplementation on granulosa cell monolayers in vitro

Previous Positions

1999, Research Coordinator, Instituto Nacional de Investigacao Agraria
1998-2000, Head of Department, Estacao Zootecnica Nacional, Animal Reproduction
1995-1999, Principal Researcher, Instituto Nacional de Investigacao Agraria
1988-1995, INIA, Auxiliar Researcher
1980-1988, INIA, Research Assistant
1978-1980, INIA, Research Fellow

Funding Received

  • Projecto AGRO 8.1 n. 438: Banco Português de Germoplasma Animal [Portuguese Animal Germplasm Bank], , 2003 to 2006.
  • Project 815/99/PIDDAC: Cultura in vitro de embriões bovinos: influência da progesterona e do tipo de células em co-cultura sobre o desenvolvimento embrionário, 1999 to 2002.
  • Project 805/98/PIDDAC: Efeito anti-conceptivo de antagonistas da progesterona: 1 - Causas ao bloqueio da migração espermática. 2 - Métodos para solucionar a infertilidade induzida, 1998 to 2001.
  • Project PRAXIS/3/3.2/AGR/01/94: Sistemas alternativos de produção de raças bovinas autóctones, 1995 to 1998.
  • Project 221/95/PIDDAC: Efeito das prostaglandinas e seus precursores na maturação dos oócitos bovinos e sua influência na fertilização e desenvolvimento embrionário 'in vitro', 1995 to 1998.
  • projecto 219/95/PIDDAC: Co-cultura de embriões in vitro em monocamadas de células placentárias, 1995 to 1998.
  • Project JNICT PIB/AGR/1477/92: Desenvolvimento de técnicas de produção in vitro de embriões de bovino e ovino, 1993 to 1996.
  • Project PIDDAC nº144/EZN: Desenvolvimento de um método de diagnóstico de gestações gemelares por doseamento de hormonas de origem placentária, 1992 to 1995.
  • Project PIDDAC nº 151/EZN: Estudo da involução uterina e das alterações ováricas pós-parto por visualização ultrasónica em tempo real, 1990 to 1993.
  • ECLAIR / EC, Project AGRE 0018: Twinning induction in bovine by the transfer of in vitro produced embryos, 1990 to 1993.
  • Project PIDDAC nº 162/EZN: Controlo da actividade ovárica pós- parto em vacas de raça alentejana, 1988 to 1990.
  • International Atomic Energy Agency: Studies on post-partum anoestrus in Alentejano beef cows, 1985 to 1988.
  • International Atomic Energy Agency: Seasonal variation of ovarian activiy in beef cows, 1983 to 1985.

Publications

  • Barbas, JP, Mascarenhas, RD, Horta, AEM, Tavares, H, Cannas-Serra, C, Cardigos, L, Moura, R, Simões, JPC, [Effect of semen extender, season and farm, on artifcial insemination results in Saloia ewes], Revista Portuguesa de Ciencias Veterinarias, 99(549), 59-63, 01 Jan 2004
  • Quaresma MA, Lopes da Costa L, Horta AEM, Robalo Silva J, Twinning induction and its effects on embryo-foetal calf survival, and on reproductive efficiency of Mertolengo cattle kept at pasture, RPCV, 99(550), 109-115, 2004
  • Horta AEM, Santos C, Barbas JP, Baptista MC, Ricardo R, Vasques MI, Cunha T, Male effect 22 days prior oestrus synchronization, enhances corpus luteum function and fertility in Merino ewes, Abstracts of 15th International Congress on Animal Reproduction, 2, 344, 01 Jan 2004
  • Barbas JP, Baptista MC, Cannas-Serra C., Marques CC, Cavaco-Gonçalves S, Vasques MI, Horta AEM, First results in portugal of artificial insemination by cervical route using ram frozen semen on reproductive performance, Abstracts of 15th International Congress on Animal Reproduction, 2, 378, 01 Jan 2004
  • Pereira RM, Baptista MC, Vasques MI, Horta AEM, Portugal PV, Bessa RJB, Marques CC, Post-thawing resistance of bovine embryos is improved by trans-10, cis-12 conjugated linoleic acid (CLA), Abstracts of 15th International Congress on Animal Reproduction, 2, 538, 01 Jan 2004
  • Barbas, JP, Cavaco-Gonçalves, S, Baptista, MC, Marques, CC, Vasques, MI, Horta, AEM, [Effect of vaginal application of cervix dilating agents (misoprostol and terbutalin sulphate) on AI results in ovine Portuguese local breeds], Revista Portuguesa de Ciencias Veterinarias, 98(548), 185-188, 01 Jan 2003
  • Barbas, J.P., Horta, A.E.M., Baptista, M.C., Marques, C.C., Cannas Serra, C., Inseminação Artificial de Ovelhas Saloias com Sémen Refrigerado e Congelado, Proceedings XXIV Reunião de Primavera da SPPF, XLII Reunião da SPOC, 34-35, 01 Jan 2003
  • Barbas JP, Horta AEM, Baptista CC, Marques CC, Variação na capacidade fertilizante do sémen refrigerado e congelado em ovelhas de raça Saloia, Proceedings IV Congreso Iberico de Reproduccion Animal, 63, 01 Jan 2003
  • Pereira, R.M., Marques, C.C., Baptista, M.C., Vasques, M.I., Horta, A.E.M., [Characterization of a placental cell monolayer culture for in vitro bovine embryo development], Revista Portuguesa de Zootecnia, 10(1), 77-87, 2003
  • Barbas, J., Mascarenhas, R., Babtista, C., Horta, A.E.M., [Effect of two PMSG doses on fertility, prolificity and fecundity of Serra da Estrela ewes submitted to double AI], Revista Portuguesa de Zootecnia, 9(2), 13-26, 01 Jan 2002
  • Marques, C.C., Pereira, R.M., Baptista, M.C., Vasques, M.I., Horta, A.E.M., [Seasonal variation on in vitro bovine embryo quality, between 1996 and 2002], Proceedings of the Veterinary sciences congress 2002, 457-458, 01 Jan 2002
  • Pereira, R.M., Marques, C.C., Baptista, M.C., Vasques, M.I., Horta, A.E.M., [Seasonal variation on in vitro bovine embryo quality, between 1996 and 2002], Proceedings of the Veterinary sciences congress 2002, 459-460, 01 Jan 2002
  • Vasques, M.I., Baptista, M.C., Pereira, R.M., Marques, C.C., Horta, A.E.M., [Effect of bovine epitelial oviduct cells (BOEC) on in vitro fertilizing ability of bull spermatozoa], 461-462, 01 Jan 2002
  • Baptista, M.C., Marques, C.C., Vasques, M.I., Pereira, R.M., Barbas, J.P., Horta, A.E.M., [Implementation of ovine in vitro fertilization technique in Portugal], Proceedings of the Veterinary sciences congress 2002, 465-466, 01 Jan 2002
  • Cavaco Gonçalves, S., Vasques, M.I., Marques, C.C., Horta, A.E.M., [Hormonal control of uterine myoelectric activity], Proceedings of the Veterinary sciences congress 2002, 467-468, 01 Jan 2002
  • Barbas, J.P., Mascarenhas, R.D., Horta, A.E.M., Tavares, H., Cannas-Serra, C., Cardigos, L., Moura, R., Cannas Simões, J.P., [Effect of semen extender, season and farm, on AI results in Saloia ewes], Proceedings of the Veterinary sciences congress 2002, 469-470, 01 Jan 2002
  • Barbas, J.P., Cavaco Gonçalves, S., Baptista, M.C., Marques, C.C., Vasques, M.I., Horta, A.E.M., [Effect of vaginal application of cervix dilating agents (misoprostol and terbutalin sulphate) on AI results in ovine Portuguese local breeds], Proceedings of the Veterinary sciences congress 2002, 471-472, 01 Jan 2002
  • Barbas, J. P., Baptista, C., Horta, A.E.M., [Comparison of two freezing methods for Merino Regional and Serra da Estrela ram semen], Proceedings of the Veterinary sciences congress 2002, 473-474, 01 Jan 2002
  • Pereira, R.M., Marques, C.C., Baptista, M.C., Vasques, M.I., Horta A.E.M., [Effetc of co-cultured cell type and concentration on in vitro bovine embryo production], Revista Portuguesa de Zootecnia, 9(1), 59-70, 2002
  • Barbas, J., Baptista, C., Mascarenhas, R., Horta A.E.M., [Effect of oxytocin on fertility, prolificacy and fecundity in artificially inseminated Serra da Estrela ewes], Revista Portuguesa de Zootecnia, 9(1), 71-78, 2002
  • Sousa, J.P.F., Barbas, J.P., Ferreira, G.M.B.C., Horta A.E.M., Variação Anual das Características Seminais em Bodes da Raça Serrana, Revista Portuguesa de Zootecnia, 8(1), 297-311, 01 Jan 2001
  • Pereira, R.M., Vasques, M.I., Cunha, T.P., Marques, C.C., Baptista, M.C., Horta, A.E.M., [Luteotrophic effect of bovine embryos and arachidonic acid (AA) on in vitro cultured granulosa cells], Proceedings III Congresso Ibérico de Reprodução Animal, 353-359, 01 Jan 2001
  • Barbas, J.P., Gonçalves, S.C., Marques, C.C., Horta, A.E.M., [Effects of intravaginal application of cervical dilatation agents during oestrous follicular phase in ewes], Proceedings III Congresso Ibérico de Reprodução Animal, 299-307, 01 Jan 2001
  • Pereira, R.M., Marques, C.C., Baptista, M.C., Vasques, M.I., Horta, A.E.M., [Effect of arachidonic acid (AA) on in vitro bovine embryos co-cultured with placental cells], Proceedings III Congresso Ibérico de Reprodução Animal, 587-594, 01 Jan 2001
  • Barbas, J.P., Sousa, J.P.F., Ferreira,G.M.B.C., Baptista, M.C., Horta A.E.M., [Annual Variation of Fresh Semen Characteristics from Merino Regional and Serra da Estrela Rams], Revista Portuguesa de Zootecnia, 8(1), 312-323, 01 Jan 2001
  • Gonçalves, S.C., Horta, A.E.M., Marques, C.C., Vasques, M.I., [Effect of PMSG and of a progesterone antagonist on uterine electromiographic activity in sheep], Proceedings III Congresso Ibérico de Reprodução Animal, 291-297, 01 Jan 2001
  • Pereira, R.M., Marques, C.C., Baptista, M.C., Vasques, M.I., Horta, A.E.M., [Effect of PGE2 and prostaglandin synthesis inhibition on bovine in vitro embryo development], Proceedings III Congresso Ibérico de Reprodução Animal, 381-386, 01 Jan 2001
  • Baptista, M.C., Marques, C.C., Pereira, R.M., Vasques, M.I, Horta, A.E.M., [Effect of prostaglandins on the first stage of in vitro bovine sperm capacitation], Proceedings III Congresso Ibérico de Reprodução Animal, 381-386, 01 Jan 2001
  • Ferreira, G.M.B.C., Sousa, J.P.F., Barbas, J.P., Horta, A.E.M., [Buck semen HOS test of Serrana breed], Proceedings III Congresso Ibérico de Reprodução Animal, 559-564, 01 Jan 2001
  • Marques, C.C., Baptista, M.C., Pereira, R.M., Vasques, M.I., Horta, A.E.M., [Effect of prostaglandins on in vitro fertilisation of bovine oocytes], Proceedings III Congresso Ibérico de Reprodução Animal, 361-369, 01 Jan 2001
  • Baptista, M.C., Marques, C.C., Pereira, R.M., Vasques, M.I., Horta, A.E.M., Effect of prostaglandins on bovine sperm capacitation and fertilisation in vitro, Theriogenology, 53(1), 416, 01 Jan 2000
  • Vasques, M.I., Cunha, T.P., Mira, J.J.F., Horta, A.E.M., Caracterização da primeira época de cobrição num grupo de novilhas da raça alentejana, Proc. X Congresso de Zootecnia, 'Progressos Zootécnicos Nos Países de Língua Oficial Portuguesa', 91, 01 Jan 2000
  • Sousa, J.P.F., Barbas, J.P., Ferreira, G.M.B.C., Horta A.E.M., Variação anual das características seminais em bodes da raça serrana, Proc. X Congresso de Zootecnia, 'Progressos Zootécnicos Nos Países de Língua Oficial Portuguesa', 87, 01 Jan 2000
  • Barbas, J.P., Sousa, J.P.F., Ferreira,G.M.B.C., Baptista, M.C., Horta A.E.M., Variação anual das características seminais de carneiros merino regional e serra da estrela, em sémen fresco, Proc. X Congresso de Zootecnia, 'Progressos Zootécnicos Nos Países de Língua Oficial Portuguesa', 88, 01 Jan 2000
  • Barbas, J.P., J.P.F., Ferreira, Sousa, G.M.B.C., Baptista, M.C., Horta A.E.M., Efeito da congelação de sémen de carneiros merino regional e serra da estrela, sobre as características seminais à descongelação, Proc. X Congresso de Zootecnia, 'Progressos Zootécnicos Nos Países de Língua Oficial Portuguesa', 86, 01 Jan 2000
  • Horta, A.E.M., Barbas, J.P., Sousa, J.P.F, Ferreira, G.M.B.C., Bodes de raça serrana podem produzir sémen todo o ano?, Investigação Agrária, 2(2), 82-83, 2000
  • Horta, A.E.M., Reprodução animal na EZN/INIA nos últimos 20 anos, Investigação Agrária, 3(3), 62-63, 2000
  • Horta, A.E.M., [Large calf syndrome associated to the transfer of in vitro produced embryos], Revista Portuguesa de Zootecnia, 6(1), 27-41, 01 Jan 1999
  • Barbas, J., Mascarenhas, R., Babtista, C., Horta, A.E.M., Efeito de duas doses de PMSG em ovelhas Serra da Estrela submetidas a dupla inseminação artificial sobre a fertilidade, prolificidade e fecundidade, Proc IX Congresso de Zootecnia, 'A Zootecnia no 3º Milénio', Porto, 133, 01 Jan 1999
  • Pereira, R.M., Marques, C.C., Baptista, M.C., Vasques, M.I., Horta, A.E.M., Caracterização duma cultura de células placentárias em monocamada para suporte do desenvolvimento de embriões bovinos produzidos in vitro, Proc IX Congresso de Zootecnia, 'A Zootecnia no 3º Milénio', Porto, 136, 01 Jan 1999
  • Pereira, R.M., Marques, C.C., Baptista, M.C., Vasques, M.I., Horta, A.E.M., Efeito do tipo e concentração de células em co-cultura na produção in vitro de embriões bovinos, Proc IX Congresso de Zootecnia, 'A Zootecnia no 3º Milénio', Porto, 137, 01 Jan 1999
  • Barbas, J., Mascarenhas, R., Babtista, C., Horta, A.E.M., Efeito da administração de oxitocina em ovelhas Serra da Estrela inseminadas artificialmente sobre a fertilidade, prolificidade e fecundidade, IX Congresso de Zootecnia, 'A Zootecnia no 3º Milénio', Porto, 138, 01 Jan 1999
  • Horta, A.E.M., Leitão, R.M., Marques, C.C., Vasques, M.I., Cunha, T.C.L.P., Como crescem os embriões in vitro, Investigação Agrária, 1(1), 70, 1999
  • Horta, A.E.M., Leitão, R.M., Marques, C.C., Vasques, M.I., Cunha, T.C.L.P., Aumentar a taxa da fertilização in vitro, Investigação Agrária, 1(1), 71-72, 1999
  • Lopes da Costa, L.F., Quaresma, M., Horta, A.E.M., Robalo Silva, J., Effect of transfer of frozen IVP cattle embryos on pregnancy maintenance of inseminated recipients, Proceedings of the 14TH SCIENTIFIC MEETING OF A.E.T.E., 208, 01 Jan 1998
  • Vasques, M.I., Marques, C.C., Pereira, R.M., Baptista, M.C., Horta, A.E.M., [Luteotrophic effect of bovine embryos and different sera supplementation on granulosa cell monolayers in vitro], Rev. Port. Cienc. Veter., 93(525), 25-30, 01 Jan 1998
  • Horta, AEM, Biotecnologia e clonagem: Utilização e ética, O Mirante (Suplemento Cultural Alma Nova), 8-9, 01 Dec 1997
  • Goncalves SC, Marques CC, Stockemann K, Wang W, Horta AE, Influence of an antiprogestin (onapristone) on in vivo and in vitro fertilization, Animal Reproduction Science, 46(1-2), 55-67, March 1997 Abstract
  • Marques, C.M., Pereira, R.M., Vasques, M.I., Baptista, M.C., Horta, A.E.M., [Role of prostaglandins on bovine oocyte maturation in vitro], Proc. 1º Congresso Ibérico de Reprodução Animal, II, 142-149, 01 Jan 1997
  • Cavaco-Gonçalves, S., Horta, A.E.M., [The effect of blocking progesterone receptors on the mechanism of ovulation in superovulated ewes], Proc. 1º Congresso Ibérico de Reprodução Animal, II, 293-298, 01 Jan 1997
  • Marques, C.C., Pereira, R.M., Vasques, M.I., Baptista, M.C., Horta, A.E.M., [Effect of cooling donor ovaries on in vitro bovine embryo production and culture of granulosa cell monolayers], Proc. 1º Congresso Ibérico de Reprodução Animal, II, 136-141, 01 Jan 1997
  • Pereira, R.M., Vasques, M.I., Marques, C.C., Baptista, M.C., Horta, A.E.M., [Effect of oestrous cow serum from superovulated animals on in vitro bovine embryo production and on progesterone synthesis of granulosa cell monolayers], Proc. 1º Congresso Ibérico de Reprodução Animal, II, 128-135, 01 Jan 1997
  • Lopes da Costa, L., Horta, A.E.M.1, Robalo Silva, J., [Effect of contralateral in vivo or in vitro embryo transfer on pregnancy maintenance of previously inseminated beef cows], Proc. 1º Congresso Ibérico de Reprodução Animal, II, 128-135, 01 Jan 1997
  • Lopes da Costa, L., Horta, A.E.M., Robalo Silva, J., Effect of progesterone supplementation on pregnancy maintenance after transfer of in vitro produced embryos in cattle, Proceedings of the 13th Scientific Meeting of A.E.T.E., 172, 01 Jan 1997
  • Pereira, R.M., Marques, C.C., Vasques, M.I., Baptista, M.C., Horta, A.E.M., [Luteotrophic effect of bovine embryos and different sera supplementation on granulosa cell monolayers in vitro.], Proceedings 1º Congresso Ibérico de Reprodução Animal, II, 150-154, 01 Jan 1997
  • Marques, C.C., Pereira, R.M., Baptista, M.C., Vasques, M.I., Horta, A.E.M., Neomycin disturbs bovine oocyte maturation and delays embryo development in vitro, Theriogenology, 47(1), 194, 01 Jan 1997
  • Pereira, R.M., Marques, C.C., Vasques, M.I., Baptista, M.C., Horta, A.E.M., [Influence of mechanical agitation and hyaluronidase performed on bovine oocytes after in vitro fertilization on embryo cleavage and development], Proc. 1º Congresso Ibérico de Reprodução Animal, II, 150-154, 01 Jan 1997
  • Vasques, M.I.,. Horta, A.E.M, Marques, C.C., Sasser, R.G. and Humblot, P., Levels of bPSPB throughout single and twin pregnancies after A1 or transfer of IVM/IVF cattle embryos, Animal Reproduction Science, 38(4), 279-289, 01 Jan 1995
  • Marques, C.C., Baptista, M.C., Pereira, R.M., Vasques, M.I., Lopes da Costa, L.F., Horta, A.E.M., Influência do sémen de diferentes touros sobre as taxas de fertilização in vitro e desenvolvimento de embriões em co-cultura, Revista Portuguesa de Zootecnia, 2(2), 103-110, 01 Jan 1995
  • Horta, A.E.M., Fisiologia do puerpério, Proc. 8as JORNADAS INTERNACIONALES DE REPRODUCCIÓN ANIMAL, 73-84, 01 Jan 1995
  • Horta, AEM, Etiopatogenia y terapéutica de la retención placentaria en la vaca, Información Veterinaria, 154, 25-34, 1995
  • Lopes da Costa, L.F., Vaz, I., Horta, A.E.M., Robalo Silva, J., Superovulation and in vivo embryo production in indigenous Portuguese cattle, Proc. 10TH SCIENTIFIC MEETING OF THE EUROPEAN EMBRYO TRANSFER ASSOCIATION, 210, 01 Jan 1994
  • Horta, AEM, Etiopatogenia e terapêutica da retenção placentária, Proceedings 7as JORNADAS INTERNACIONALES DE REPRODUCCIÓN ANIMAL, AERA, Murcia, 181-192, 01 Jan 1994
  • Horta, A.E.M., Chagas E Silva, J.N., Cannas Simões, J.P., Vasques, M.I., Inseminação artificial em vacas de raça Brava, Proceedings 7as JORNADAS INTERNACIONALES DE REPRODUCCIÓN ANIMAL, AERA, Murcia, 213, 01 Jan 1994
  • Vasques, M.I., Marques, C.C., Horta, A.E.M., Humblot, P., Sasser, R.G, [Twin pregnancy and embryo/fetal loss diagnosis in cows by measuring PSPB], Proc. 5º SIMPOSIO INTERNACIONAL DE REPRODUCAO ANIMAL, II, 75-81, 01 Jan 1993
  • Horta, A. E. M., Vasques, M. I., e Marques, C.C., [Understanding progesterone profiles during oestrus cycle synchronisation prior to in vitro embryo transfer in Alentejano beef cows], Proc. 5º SIMPOSIO INTERNACIONAL DE REPRODUCAO ANIMAL, II, 58-64, 01 Jan 1993
  • Marques, C.C., Vasques, M.I., Horta, A.E.M., [Effect of twin suckling and placental retention on the onset of postpartum ovarian activity in Alentejano beef cows], Proc. 5º SIMPOSIO INTERNACIONAL DE REPRODUCAO ANIMAL, II, 8-14, 01 Jan 1993
  • Marques, C.C., Vasques, M.I., Horta, A.E.M., [Effect of twinning ang calving induction on the incidence of placental retention and its prevention by administering prostaglandin F2 alpha], Proc. 5º SIMPOSIO INTERNACIONAL DE REPRODUCAO ANIMAL, II, 112-118, 01 Jan 1993
  • Marques, C.C., Vasques, M.I., Horta, A.E.M., Humblot, P. e Sasser, G., [Postpartum levels of PSPB in Alentejano beef cows], Proc. 5º SIMPOSIO INTERNACIONAL DE REPRODUCAO ANIMAL, II, 82-98, 01 Jan 1993
  • Horta, A.E.M., Marques, C.C., Vasques, M.I., Leitão, R.M., Vaz Portugal, A., [Inducing twinning in beef cows by the transfer of in vitro produced embryos.], Proc.5º SIMPOSIO INTERNACIONAL DE REPRODUCAO ANIMAL, II, 163-172, 01 Jan 1993
  • Lopes da Costa, L.F., Marques, C.M., Vasques, M.I., Horta, A.E.M., Superovulação e produção de embriões na raça bovina Alentejano, Proceedings 5º SIMPÓSIO INTERNACIONAL DE REPRODUÇÃO ANIMAL, Luso, II, 125-131, 01 Jan 1993
  • Horta, A.E.M., Marques, C.M., Vasques, M.I., Leitão, R.M., Effect of inducing calvings on calf birth weight, Proc. 12th INTERNATIONAL CONGRESS ON ANIMAL REPRODUCTION, The Hague, The Netherlands, 895-897, 01 Jan 1992
  • Cavaco-Gonçalves, S., Marques, C.M., Vasques, M.I., Horta, A.E.M., [Use of RU 486 during superovulation in ewes with PMSG], Proc. VI JORNADAS INTERNACIONALES EN REPRODUCCIÓN ANIMAL E IA, 343-347, 01 Jan 1992
  • Horta, A.E.M., Fecundação in vitro em bovinos de carne, Proceedings VI JORNADAS INTERNACIONALES DE REPRODUCCIÓN ANIMAL E INSEMINACIÓN ARTIFICIAL, Salamanca, 130, 01 Jan 1992
  • Lopes da Costa, L.F., Chagas e Silva, J.N., Cidadão, M.R., Marques, C.M., Vasques, M.I., Horta, A.E.M., Ausência de fertilização em vacas Alentejanas superovuladas com PMSG e N-PMSG, Proceedings VI JORNADAS INTERNACIONALES EN REPRODUCCIÓN ANIMAL E IA, Salamanca, 209-215, 01 Jan 1992
  • Pereira, R.L.N., Horta, A.E.M., Leitão, R.M., Produção de soros anti-embrião para diagnóstico precoce de gestação em ovinos, Proceedings JORNADAS INTERNACIONAIS SOBRE REPRODUÇÃO OVINA E CAPRINA, SPRA / SPOC, 129-140, 01 Jan 1991
  • Horta, A.E.M., Vasques, M.I., Leitão, R.M., Robalo Silva, J., Studies on post-partum anoestrus in Alentejano beef cows, In: STUDIES ON THE REPRODUCTIVE EFFICIENCY OF CATTLE USING RADIOIMMUNOASSAY TECHNIQUES, Application of Radioimmunoassay to Improving the Reproductive Efficiency and Productivity of Large Ruminants, Ed. Joint FAO/IAEA Division, Vienna, 9-19, 01 Jan 1990
  • Horta, A.E.M., Irene Vasques, M., Leitão. R.M., Robalo Silva, J., Início da actividade ovárica pós-parto na vaca Alentejana: Influência de épocas de parição e de anos diferentes, Proc. V JORNADAS INTERNACIONAIS EN REPRODUCCIÓN ANIMAL E I.A. (Ponencias y comunicaciones no incluidas n los tomos I y II), 51-69, 01 Jan 1990
  • Horta, A.E.M., Irene Vasques, M., Leitão. R.M., Robalo Silva, J. et Vaz Portugal, A., Anoestrus post-partum chez la vache a viande Alentejano - Effet de la saison et de l'interruption temporaire de l'allaitement, Comptes Rendus de l'Academie d'Agriculture de France, 75, 32-36, 01 Jan 1989
  • Horta, A.E.M., Controlo hormonal da reprodução: Terapêutica de distúrbios reprodutivos no pós-parto e sincronização do ciclo, A Vaca Leiteira, 3(19), 42-47, 01 Jan 1989
  • Horta, AEM, Transferência embrionária e inseminação artificial na produção pecuária [Artificial insemination and embryo transfer on portuguese animal production] (review article), Vida Rural, 7, 26-30, 01 Jan 1989
  • Horta, AEM, [Oocyte maturation and fertilization in vitro - Applications on bovine reproduction] (review article), Vida Rural, 19, 18-21, 1989
  • Horta, AEM, [Role of prostaglandins on the mechanism of placental separation in the cow], PhD-Like Research Thesis, INIA-Ministry of Agriculture, 13 May 1988
  • Carla Marques, C. and Horta, A.E.M., Onset of ovarian activity in the post-partum cow and its correlation with uterine involution, Proceedings XXIII WORLD VETERINARY CONGRESS, Montreal - Canada, 118, 1987
  • Horta, A.E.M., Irene Vasques, M. and Leitão, R.M., The effect of calf removal on the resumption of postpartum ovarian activity in Alentejano cows during spring or autumn, Proceedings XXXVIII ANNUAL MEETING OF THE EAAP, II, 730, 1987
  • Robalo Silva, J., Horta, A.E.M., Irene Vasques, M., Leitão, R.M. and Cláudio, D., The effect of calving season on the duration of postpartum anoestrus in Alentejano beef cows, Proceedings XXXVIII ANNUAL MEETING OF THE EAAP, II, 732, 1987
  • Horta, A.E.M., Ribeiro, L., Paula Santos, F. and Irene Vasques, M., Study of the onset of puberty in Serrana goats by plasma progesterone profiles - First approach, Proceedings XXXVIII ANNUAL MEETING OF THE EAAP, II, 918, 1987
  • Carla Marques, C. and Horta, A.E.M., Completion of uterine involution and onset of postpartum ovarian activity and their correlation with retained placenta and metritis in dairy cows, Proceedings XXXVIII ANNUAL MEETING OF THE EAAP, I, 584, 1987
  • Horta, AEM, [Placental retention in dairy cows. An outlook] (review article), A Vaca Leiteira, 2(9), 44-47, 1987
  • Mascarenhas, R.D., Rios Vasques, M.I., Horta, A.E.M., Robalo Silva, J. e Vaz Portugal, A., Seasonal variation in the ovarian activity of beef cows, assessed by monitoring progesterone concentrations, Animal Reproduction Science, 10, 251-259, 1986
  • Robalo Silva, J., Horta, A.E.M., Rios Vasques, M., Leitão, M. and Cláudio, D., Postpartum anoestrus in beef cows: a comparison between two groups of animals calving at dIfferent times of the year, Proceedings INTERNATIONAL SYMPOSIUM ON THE USE OF NUCLEAR TECHNIQUES IN STUDIES OF ANIMAL PRODUCTION AND HEALTH IN DIFFERENT ENVIRONMENTS, IAEA-SM-292/5P, 93, 1986
  • Horta, A.E.M., Costa, C.M.S.G., Robalo Silva, J., Rios Vasques, M., Possibility of reducing the luteolytic dose of cloprostenol in cyclic dairy cows, Theriogenology, 25, 291-230, 1986
  • Horta AE, Chassagne M, Brochart M, Prostaglandin F2 alpha and prostacyclin imbalance in cows with placental retention: new findings, Annales De Recherches Veterinaires. Annals of Veterinary Research, 17(4), 395-400, 1986 Abstract
  • Horta, A.E.M., [Effect of prostaglandins E2 and F2alpha on placental retention induced by lysine acetil-salycilate in dairy cows], Zootechnia, 33, 39-48, 1984
  • Horta, AEM, A summary of studies concerning the effects of prostaglandin synthesis inhibition, PGE2 and PGF2alpha, on the expulsion of placenta and myometrial activity in the cow, Proceedings Xth INTERNATIONAL CONGRESS OF ANIMAL REPRODUCTION AND AI, Urbana, Illinois-USA, II, 413, 1984
  • Horta, AEM, [Prostaglandins and placental retention in the cow: review.], Rev. Port. Ciênc. Veter., 78, 277-289, 1983
  • Horta, AEM, Costa, CMSG, [Reproductive cycle synchronization in a portuguese dairy herd with PGF2alpha], Rev. Port. Ciênc. Veter., 77, 215-230, 1982
  • Horta, A.E.M., [Action of lysine acetil-salicylate on placental expulsion in cattle], Revista Portuguesa de Ciencias Veterinarias, 76, 207-212, 1981

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