Comparison between the use of male effect associated or not with progesterone on reproductive performance of ewes created in Serra Talhada - PE / Comparação entre o uso do efeito macho associado ou não ao uso de progestágeno no desempenho reprodutivo de ovelhas deslanadas criadas no municipio de Serra Talhada PE

This study aimed to compare the use of the male effect associated or not with progesterone on the reproductive performance of cyclical ewes. A total of 20 pluriparous females aged between 24 and 72 months and one breeder aged 18 months were used. The females were randomized into two groups. In Group I (n = 10), placed next to the male to have their estrus synchronized only by the male effect. Group II (n = 10), the females were previously submitted to the use of progesterone 0.33g adduced by a vaginal device for 11 days and then exposed to the male in the same area at the same time as the GI. Data were analyzed by chi-square test at a significance level of 5%. After 45 days of mating season, the estrus rate in GI was 70%, with 30% of females showing a second and third es­trus. In GII, the estrus rate was 50% with only 10% having a second estrus. The pregnancy rate in GI was 90% and was 100% in GII, with no significant diffe­rence between estrus and pregnancy rates in both groups (P> 0.05). These data support the conclusion that the male effect as an estrus synchronizer mechanism may be used without need for progesterone.

Este trabalho teve como objetivo comparar o uso do efeito macho as­sociado ou não ao uso de progestágeno sobre o desempenho reprodutivo de ovelhas deslanadas cíclicas sem cria ao pé criadas em regime semi-intensivo no Município de Serra Talhada em Pernambuco. Foram utilizadas fêmeas plurípa­ras SRD (n=20) com idade entre 24 a 72 meses e um reprodutor da raça Santa Inês com idade de 18 meses. As fêmeas foram distribuídas aleatoriamente em dois grupos. No Grupo I (n=10), colocadas junto ao reprodutor, para terem seu estro sincronizado somente pelo efeito macho. No Grupo II (n=10), as fêmeas foram previamente submetidas ao uso de 0,33g de progesterona carreados por um dispositivo vaginal durante 11 dias e depois expostas ao efeito macho pelo reprodutor no mesmo piquete e ao mesmo tempo que o GI. Os dados de estro e prenhez foram avaliados pelo teste do Qui-quadrado ao nível de significância de 5%. Após uma estação de monta de 45 dias, a taxa de estro no GI foi de 70%, com 30% das fêmeas apresentando um segundo e terceiro estro. No GII, a taxa de estro foi de 50% com apenas 10% apresentando um segundo estro. A taxa de prenhez no GI foi de 90% e no GII foi de 100%, não havendo diferença sig­nificativa nas taxas de estro e prenhez entre os grupos testados (P>0,05). Esses dados permitem concluir que o efeito macho como mecanismo sincronizador de estro pode ser utilizado sem a necessidade de progestágenos.

Comparison between the use of male effect associated or not with progesterone on reproductive performance of ewes created in Serra Talhada - PE / Comparação entre o uso do efeito macho associado ou não ao uso de progestágeno no desempenho reprodutivo de ovelhas deslanadas criadas no municipio de Serra Talhada PE

This study aimed to compare the use of the male effect associated or not with progesterone on the reproductive performance of cyclical ewes. A total of 20 pluriparous females aged between 24 and 72 months and one breeder aged 18 months were used. The females were randomized into two groups. In Group I (n = 10), placed next to the male to have their estrus synchronized only by the male effect. Group II (n = 10), the females were previously submitted to the use of progesterone 0.33g adduced by a vaginal device for 11 days and then exposed to the male in the same area at the same time as the GI. Data were analyzed by chi-square test at a significance level of 5%. After 45 days of mating season, the estrus rate in GI was 70%, with 30% of females showing a second and third es­trus. In GII, the estrus rate was 50% with only 10% having a second estrus. The pregnancy rate in GI was 90% and was 100% in GII, with no significant diffe­rence between estrus and pregnancy rates in both groups (P> 0.05). These data support the conclusion that the male effect as an estrus synchronizer mechanism may be used without need for progesterone. (AU)

Este trabalho teve como objetivo comparar o uso do efeito macho as­sociado ou não ao uso de progestágeno sobre o desempenho reprodutivo de ovelhas deslanadas cíclicas sem cria ao pé criadas em regime semi-intensivo no Município de Serra Talhada em Pernambuco. Foram utilizadas fêmeas plurípa­ras SRD (n=20) com idade entre 24 a 72 meses e um reprodutor da raça Santa Inês com idade de 18 meses. As fêmeas foram distribuídas aleatoriamente em dois grupos. No Grupo I (n=10), colocadas junto ao reprodutor, para terem seu estro sincronizado somente pelo efeito macho. No Grupo II (n=10), as fêmeas foram previamente submetidas ao uso de 0,33g de progesterona carreados por um dispositivo vaginal durante 11 dias e depois expostas ao efeito macho pelo reprodutor no mesmo piquete e ao mesmo tempo que o GI. Os dados de estro e prenhez foram avaliados pelo teste do Qui-quadrado ao nível de significância de 5%. Após uma estação de monta de 45 dias, a taxa de estro no GI foi de 70%, com 30% das fêmeas apresentando um segundo e terceiro estro. No GII, a taxa de estro foi de 50% com apenas 10% apresentando um segundo estro. A taxa de prenhez no GI foi de 90% e no GII foi de 100%, não havendo diferença sig­nificativa nas taxas de estro e prenhez entre os grupos testados (P>0,05). Esses dados permitem concluir que o efeito macho como mecanismo sincronizador de estro pode ser utilizado sem a necessidade de progestágenos. (AU)

Use of the male effect associated with different durations of mating season in goats in the semiarid of Pernambuco / Uso do efeito macho associado a diferentes durações de estação de monta em caprinos no semiárido pernambucano

Background: The goat rearing is practiced mainly in the Northeast region with semiarid climate, since climate conditionsand vegetation are extremely favorable to the species, but it has low productivity due to the low level of technology employed. Management alternatives aimed at maximizing productivity at low cost are essential tools for the reversal of thisframework. Aiming to focus the onset of estrus for females at low cost is common to use the male effect with the breedingseason, representing a practical, inexpensive and efficient methodology for the producer Thus, this study is to evaluate theeffect of different durations of mating season associated with the male effect on reproductive performance of multiparousAlpine goats during the dry and rainy seasons.Materials, Methods & Results: The survey was conducted in the municipality of Serra Talhada-PE from October 2011 toMay 2013. A total of 160 multiparous females aged between 22 and 74 months and four breeders aged between 24 and 38months were used. In the first step, we tested the mating season durations 25 (MS-25) and 45 days (MS-45). In the secondstep, the mating seasons were 25 (MS-25) and 15 days (MS-15) in different climate periods, each experimental groupconsisting of 20 females and one breeder that has been away from females for 15 days before starting the season in orderto stimulate the male effect and thus synchronizing the estrus. The lots were observed at 6:00 and 16:00 pm by qualifiedpersonnel to identify the mated females and after 45 days of the last mating, an ultrasound examination was performed todetect the matrices that had positive pregnancy, assessing the data by the Chi-square test at 5% significance. The estrusresults obtained during the first stage of...

Use of the male effect associated with different durations of mating season in goats in the semiarid of Pernambuco / Uso do efeito macho associado a diferentes durações de estação de monta em caprinos no semiárido pernambucano

Background: The goat rearing is practiced mainly in the Northeast region with semiarid climate, since climate conditionsand vegetation are extremely favorable to the species, but it has low productivity due to the low level of technology employed. Management alternatives aimed at maximizing productivity at low cost are essential tools for the reversal of thisframework. Aiming to focus the onset of estrus for females at low cost is common to use the male effect with the breedingseason, representing a practical, inexpensive and efficient methodology for the producer Thus, this study is to evaluate theeffect of different durations of mating season associated with the male effect on reproductive performance of multiparousAlpine goats during the dry and rainy seasons.Materials, Methods & Results: The survey was conducted in the municipality of Serra Talhada-PE from October 2011 toMay 2013. A total of 160 multiparous females aged between 22 and 74 months and four breeders aged between 24 and 38months were used. In the first step, we tested the mating season durations 25 (MS-25) and 45 days (MS-45). In the secondstep, the mating seasons were 25 (MS-25) and 15 days (MS-15) in different climate periods, each experimental groupconsisting of 20 females and one breeder that has been away from females for 15 days before starting the season in orderto stimulate the male effect and thus synchronizing the estrus. The lots were observed at 6:00 and 16:00 pm by qualifiedpersonnel to identify the mated females and after 45 days of the last mating, an ultrasound examination was performed todetect the matrices that had positive pregnancy, assessing the data by the Chi-square test at 5% significance. The estrusresults obtained during the first stage of...(AU)