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• W2103131608 abstract "Background: The goat rearing is practiced mainly in the Northeast region with semiarid climate, since climate conditions and 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 this framework. Aiming to focus the onset of estrus for females at low cost is common to use the male effect with the breeding season, representing a practical, inexpensive and efficient methodology for the producer Thus, this study is to evaluate the effect of different durations of mating season associated with the male effect on reproductive performance of multiparous Alpine goats during the dry and rainy seasons. Materials, Methods & Results: The survey was conducted in the municipality of Serra Talhada-PE from October 2011 to May 2013. A total of 160 multiparous females aged between 22 and 74 months and four breeders aged between 24 and 38 months were used. In the first step, we tested the mating season durations 25 (MS-25) and 45 days (MS-45). In the second step, the mating seasons were 25 (MS-25) and 15 days (MS-15) in different climate periods, each experimental group consisting of 20 females and one breeder that has been away from females for 15 days before starting the season in order to stimulate the male effect and thus synchronizing the estrus. The lots were observed at 6:00 and 16:00 pm by qualified personnel to identify the mated females and after 45 days of the last mating, an ultrasound examination was performed to detect the matrices that had positive pregnancy, assessing the data by the Chi-square test at 5% significance. The estrus results obtained during the first stage of the survey were 80% in the MS-25 and 45% in the MS-90 in the dry season and the rainy season; the groups showed 100% estrus. In the second stage of the research, there was 100% estrus for Ms-15 and MS-25, independent of climatic period. No difference was observed between groups (P > 0.05) at each step. The pregnancy rate obtained in the first stage of the survey was 70% in MS-25 and 60% in MS-45, while in the rainy season it was 100% in MS-25 and 95% in MS-45. In the second stage of the research were achieved 60% in MS-15 and 80% in MS-25% in the dry season, while during the rainy season the MS-15 showed 90% and MS-25 with 100% pregnancy. No significant difference was observed between groups (P > 0.05) at each step. Discussion: The manifestations of estrus in the different mating seasons and different climate periods were in early the breeding season established with estrus peak from 6th to 10th day after exposure to the breeder. The pregnancy rates were considered satisfactory, considering that the years 2012 and 2013 were atypical in the semiarid region of Northeast showing accumulated rainfall quite below the normal range and resulting in low availability and quality of pastures. Similar results were found by researchs in the Laguna region of Mexico, which, with the use of the male effect, found 92.3 % of estrus in goats. Lower results were obtained in the Municipality of Mossoro-RN in the dry season, with 30 % estrus index and no positive pregnancy in mating season of 63 days. The duration of breeding season can be reduced in association with male optimizing the effect associated with this type of management and maximizing the use of animals in the production system." @default.
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• W2103131608 date "2014-01-01" @default.
• W2103131608 modified "2023-09-27" @default.
• W2103131608 title "Use of the male effect associated with different durations of mating season in goats in the semiarid of Pernambuco." @default.
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