Protocolo reprodutivo em bovinos – avaliação da administração de PGF2alfa no momento de remoção de CIDR
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2017
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A reprodução de ruminantes nos dias atuais tornou-se muito diferente do que era
realizado há um século atrás, devido quer ao aparecimento da Inseminação Artificial (IA)
quer ao desenvolvimento dos protocolos de controlo hormonal.
Com este trabalho, pretendeu-se introduzir uma alteração num protocolo reprodutivo
com o objetivo de diminuir uma manipulação dos animais e consequentemente os custos e o
stress que essa manipulação implica.
Numa amostra de 20 vacas leiteiras (n= 20), administrou-se GnRH e colocou-se um
CIDR no dia 0. No dia 6 dividiu-se a amostra em dois grupos e administrou-se a um grupo
(controlo) 5 ml do análogo da PGF2α enquanto que no outro grupo (tratamento), esta
administração ocorreu no dia 7, coincidindo com a retirada do CIDR feita em todas as vacas.
Realizou-se IA a tempo fixo (IATF) 72 horas após a administração da PGF2α,
complementando-se com a realização de deteção de cios. Realizaram-se ainda
ultrassonografias retais a todos os animais nos dias 0, 7 e dia da IA a fim de registar todas as
alterações sofridas nas gónadas e trato reprodutivo. Os dados recolhidos incluem a presença,
número e tamanho de folículos e corpos de lúteo e a tonicidade e presença de muco do útero.
Os resultados obtidos foram inferiores ao que era esperado, uma vez que a taxa de
conceção obtida foi de apenas 20% para o Grupo Controlo e 30% para o Grupo Tratamento,
muito inferior quando comparado com a literatura disponível. Apesar disso, pôde-se verificar
que o uso da PGF2α no momento da retirada do CIDR pode ser uma boa aposta
principalmente em animais de mais difícil maneio e que sofram facilmente de stress uma vez
que se reduz uma manipulação, ou até mesmo para economizar nos custos de logística.
Nowadays a great improvement has been obtained in reproductive management in ruminants namely by the emergence of Artificial Insemination (AI) and the development of hormonal protocols. In this work we intended to introduce an alteration in a reproductive protocol with the aim of lowering animal manipulation and consequently, the costs and stress that this implies in labor and animal welfare. GnRH was administered in day 0 to a sample of 20 dairy cows (n = 20) which also received a CIDR . In day 6 the sample was divided in two as a control group (n=10) that received 5 ml of an analogue of PGF2α and the treatment group (n=10) received the same dosis in D7. At this time, CIDR was withdrawal from all cows. IATF took place 72 hours after the administration of PGF2α, and estrous occurrence recorded. Retal ultrasound examination was performed to all cows on days 0, 7 and at the day of AI. Data recorded included presence and size of follicles and corpus luteum and the tonicity and presence of mucous in the reproductive tract. The results obtained in this study were in terms of conception rate lower than those described in the literature (20% vs 30% in control and treatment group, respectively). Despite this, it seems that the use of PGF2α at the moment of CIDR’s removal, could be a good option, especially in hard-handling animals, which easily suffer stress from handling or even to reduce the logistic costs.
Nowadays a great improvement has been obtained in reproductive management in ruminants namely by the emergence of Artificial Insemination (AI) and the development of hormonal protocols. In this work we intended to introduce an alteration in a reproductive protocol with the aim of lowering animal manipulation and consequently, the costs and stress that this implies in labor and animal welfare. GnRH was administered in day 0 to a sample of 20 dairy cows (n = 20) which also received a CIDR . In day 6 the sample was divided in two as a control group (n=10) that received 5 ml of an analogue of PGF2α and the treatment group (n=10) received the same dosis in D7. At this time, CIDR was withdrawal from all cows. IATF took place 72 hours after the administration of PGF2α, and estrous occurrence recorded. Retal ultrasound examination was performed to all cows on days 0, 7 and at the day of AI. Data recorded included presence and size of follicles and corpus luteum and the tonicity and presence of mucous in the reproductive tract. The results obtained in this study were in terms of conception rate lower than those described in the literature (20% vs 30% in control and treatment group, respectively). Despite this, it seems that the use of PGF2α at the moment of CIDR’s removal, could be a good option, especially in hard-handling animals, which easily suffer stress from handling or even to reduce the logistic costs.
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Orientação: Carlos Bettencourt
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MESTRADO INTEGRADO EM MEDICINA VETERINÁRIA, MEDICINA VETERINÁRIA, VETERINÁRIA, BOVÍDEOS, REPRODUÇÃO ANIMAL, INSEMINAÇÃO ARTIFICIAL VETERINÁRIA, VETERINARY MEDICINE, BOVIDS, ANIMAL BREEDING, ARTIFICIAL INSEMINATION OF ANIMALS