Indução do parto em coelhas com prostaglandinas ou oxitocina. Efeitos sobre as performances produtivas das reprodutoras e das ninhadas
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2016-01-25
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Foi avaliada a produtividade de coelhas sujeitas a induções de parto sucessivas com cloprostenol (análogo sintético da PGF2α) ou oxitocina. O ensaio teve início com 75 coelhas nulíparas, inseminadas às 18 semanas de idade, que foram acompanhadas ao longo de 4 ciclos reprodutivos (desde a IA até ao desmame dos láparos). As coelhas foram alojadas em jaulas individuais e divididas em 4 tratamentos: grupo controlo (C; n=18), no qual o parto não foi induzido; grupo PG28, em que foi administrado cloprostenol (Estrumate®), ao dia 28 de gestação (n=19); grupo PG29, em que foi administrada a mesma substância mas ao dia 29 de gestação (n=19); e grupo OX30, em que foi administrado oxitocina (Placentol®) ao dia 30 de gestação (n=19). Foram administrados 0,2ml/coelha de Estrumate® e 0,15ml/kgPV de Placentol®, por via intramuscular. Ao longo do ensaio foi controlada a taxa de fertilidade e a prolificidade das coelhas, a mortalidade das reprodutoras e dos láparos e a performance de crescimento dos láparos através de pesagens ao nascimento, aos 18 dias de idade e ao desmame. Os dados referentes ao 1º ciclo reprodutivo não foram contabilizados. Apesar de não se terem verificado diferenças significativas para a taxa de fertilidade entre os tratamentos, as diferenças observadas foram elevadas, sendo os grupos PG28 e PG29 os que apresentaram maior valor em comparação ao grupo C (82,2% e 87,8% vs. 73,6%, respetivamente). A prolificidade foi significativamente afetada pelos tratamentos, com o grupo PG28 a apresentar um valor superior em relação ao grupo C (11,05 vs. 9,25). O peso da ninhada ao nascimento não foi afetado pelo tratamento, mas o peso individual dos láparos ao nascimento foi menor no grupo PG28 (51,6 g) em relação a C e OX30 (57,3 g e 59,8 g, respetivamente). O grupo OX30 apresentou elevada incidência de distócia (33,3%). A taxa de mortalidade das reprodutoras e dos láparos não foi afetada pelos tratamentos, assim como os ganhos médios diários dos láparos até ao desmame. Não se verificaram diferenças significativas entre os tratamentos para a produtividade das coelhas (Kg de láparo desmamado por coelha inseminada), embora os grupos PG28 e PG29 apresentem valores mais elevados em comparação ao grupo C (4,93 Kg e 4,93 Kg vs. 4,45 Kg, respetivamente). Embora o estudo não seja conclusivo em relação à produtividade, verificou-se que a indução do parto com o análogo sintético da PGF2α pode melhorar a performance reprodutiva das coelhas. Uma maior dimensão da amostra poderia ser mais expressiva em termos de resultados.
Was evaluated the rabbit’s productivity when subjected to successive induced parturitions with cloprostenol (a synthetic PGF2α analogue) or oxytocin. The trial began with 75 nuliparous does, which were inseminated at 18 weeks old. The does were followed during the 4 reproductive cycles (from artificial insemination to weaning). The does were housed in individual cages and divided in 4 treatments: control group (C; n=18), in which the parturition was not induced; PG28 group, in which was administrated cloprostenol (Estrumate®) on 28th day of pregnancy (n=19); PG29 group, in which was administrated the same substance but on 29th day of pregnancy (n=19); and OX30 group, which was administrated oxytocin (Placentol®) on 30th day of gestation (n=19). Were injected 0,15ml/kgBW of Placentol® and 0,2ml/doe of Estrumate®, intramuscularly. During the trial was controlled the fertility rate and the prolificacy of the does, the mortality of does and kits and also the growth performance of kits, throw the weighing at birth, at 18th day old and on weaning. The data about the 1st reproductive cycle were not accounted. Although there have been no significant differences about the fertility rate between treatments, the differences observed were high. The PG28 and PG29 groups showed a higher value comparative to C (82,2% and 87,8% vs. 73,6%, respectively). The prolificacy was significantly affected by the treatments. The PG28 group presented a higher value than C (11,05 vs. 9,25). The litter birth weight was not affected by treatment, but the individual birth weight of kits was lower on PG28 (51,6 g) comparative to C or OX30 (57,3g and 59,8g, respectively). OX30 presented a high incidence of dystocia (33,3%). The does mortality rate and the kits mortality rate were not affected by treatments and also the daily average growth of kits until weaning. There were no significant differences between treatments for the productivity (Kg of kits weaned per inseminated doe), although the groups PG28 and PG29 presented a higher value than C (4,93 Kg e 4,93 Kg vs. 4,45 Kg, respectively). Despite the study was not conclusive about the productivity, was showed that the induced parturition with the synthetic PGF2α analogue can improve the does reproductive performance. A larger sample could be more expressive about the results.
Was evaluated the rabbit’s productivity when subjected to successive induced parturitions with cloprostenol (a synthetic PGF2α analogue) or oxytocin. The trial began with 75 nuliparous does, which were inseminated at 18 weeks old. The does were followed during the 4 reproductive cycles (from artificial insemination to weaning). The does were housed in individual cages and divided in 4 treatments: control group (C; n=18), in which the parturition was not induced; PG28 group, in which was administrated cloprostenol (Estrumate®) on 28th day of pregnancy (n=19); PG29 group, in which was administrated the same substance but on 29th day of pregnancy (n=19); and OX30 group, which was administrated oxytocin (Placentol®) on 30th day of gestation (n=19). Were injected 0,15ml/kgBW of Placentol® and 0,2ml/doe of Estrumate®, intramuscularly. During the trial was controlled the fertility rate and the prolificacy of the does, the mortality of does and kits and also the growth performance of kits, throw the weighing at birth, at 18th day old and on weaning. The data about the 1st reproductive cycle were not accounted. Although there have been no significant differences about the fertility rate between treatments, the differences observed were high. The PG28 and PG29 groups showed a higher value comparative to C (82,2% and 87,8% vs. 73,6%, respectively). The prolificacy was significantly affected by the treatments. The PG28 group presented a higher value than C (11,05 vs. 9,25). The litter birth weight was not affected by treatment, but the individual birth weight of kits was lower on PG28 (51,6 g) comparative to C or OX30 (57,3g and 59,8g, respectively). OX30 presented a high incidence of dystocia (33,3%). The does mortality rate and the kits mortality rate were not affected by treatments and also the daily average growth of kits until weaning. There were no significant differences between treatments for the productivity (Kg of kits weaned per inseminated doe), although the groups PG28 and PG29 presented a higher value than C (4,93 Kg e 4,93 Kg vs. 4,45 Kg, respectively). Despite the study was not conclusive about the productivity, was showed that the induced parturition with the synthetic PGF2α analogue can improve the does reproductive performance. A larger sample could be more expressive about the results.
Descrição
Dissertação de Mestrado em Engenharia Zootécnica
Palavras-chave
Coelho , Parto , Cloprosterol , Oxitocina , Prostaglandina , Reprodutividade