Parity of female goats does not influence their estrous and ovulatory responses to the male effect

Luna-Orozco, Juan Ramón; Fernández, Ilda G.; Gelez, Hélène; Delgadillo, J.A.

doi:10.1016/j.anireprosci.2007.05.011

Cited by 15 publications

(11 citation statements)

References 22 publications

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“…2,5,[14][15][16][17] Mating events are expected to be observed within an 15-25 day period after male introduction to the female herd. 14,15,17,18 These results and the data described here support the hypothesis that females can exhibit from one to three estrous within an 35-day period, 17 since female goats have estrous cycle ranging from 18 and 22 days, 19 but estrous cycles of less than 17 days have been observed. 1 Here, most female goats had one single estrous and only a small fraction exhibited three estrous during the DS (5%), and a second estrous was observed within an average period of 12.44 days.…”

Section: Discussionsupporting

confidence: 78%

Duration of the breeding season on the reproductive performance of Anglo-Nubian goats during dry and rainy periods

et al. 2014

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The study was aimed to evaluate the effect of breeding season (BS) duration on goat reproduction during dry (DS) and rainy (RS) periods. Females were kept 300 m apart from bucks for 60 days. Females were randomly distributed among BS groups of 25 (BS25), 35 (BS35), and 45 (BS45) days during DS and RS. All females cycled, except during BS45 in DS (95%). The duration of BS did not affect estrous incidence during DS and RS. The percentage of females with two estrous was similar in RS (BS25: 30%, BS35: 35%, BS45: 35%) and DS (BS25: 25%, BS35: 30%, BS45: 25%). Three estrous were observed in BS35 and BS45 during RS (5%). First estrous (FE) and second estrous (SE) were detected from days in BS25 (FE: 1-21, SE: 7-21), BS35 (FE: 1-23, SE: 6-27), and BS45 (FE:1-23, SE: 9-20) during RS. During DS, estrous were detected within days BS25 (FE: 1-17, SE: 6-23), , and BS45 (FE: 2-21, SE: 6-21). Pregnancy rates were similar in RS (BS25: 90%, BS35: 95%, BS45: 95%) and DS (BS25: 75%, BS35: 80%, BS45: 75%). In conclusion, goat BS can be shorten despite weather without any effect on reproduction.

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Section: Discussionsupporting

confidence: 78%

Duration of the breeding season on the reproductive performance of Anglo-Nubian goats during dry and rainy periods

et al. 2014

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“…Além disso, considerando-se o número de fêmeas prenhes observou-se que dois terços das prenhezes obtidas foram registrados no primeiro serviço, tanto no Semiárido quanto na Zona da Mata, mostrando a existência de influência do efeito macho sobre a indução e concentração de estros. Mesmo com fêmeas nulíparas os resultados desse trabalho são semelhantes aqueles reportados com fêmeas pluríparas na espécie ovina [5] e com fêmeas nulíparas da espécie caprina [21].…”

Section: Discussionunclassified

Role of Male effect on Reproductive Efficiency of Nulliparous Santa Inês and Morada Nova ewes raised in Different Regions

Filho

Ferreira-Silva

Nascimento

et al. 2016

Acta Scientiae. Vet.

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Background:The male effect is an attractive strategy to increase herd production by concentrating mating events and deliveries and further allowing the adoption of genetic improvement programs. It holds similar efficiency to those chemically based estrous synchronization methods, but has the advantage of being a natural method. The work was aimed to evaluate the influence of male effect on estrous induction and synchronization, pregnancy and prolificacy of nulliparous Santa Inês and Morada Nova ewes raised in Semiarid and Zona da Mata regions of Pernambuco state. Materials, Methods & Results: Santa Inês (n = 80) and Morada Nova (n = 80) females, with age from 11 to 12 months, after being evaluated and selected, were identified with plastic ear tags, weighted and maintained isolated from males, during 30 days before experiment onset, without any physical, visual, olfactive and auditive contact. Estrous events were observed twice a day (6:00 and 16:00 h) by trained personnel, during a breeding season of 60 days, and estrous were considered synchronized when detected, within first five days of breeding season. Rams of Santa Inês (n = 2) and Morada Nova (n = 2) breeds were selected based upon reproductive capacity by an andrology exam, and were marked on the externum bone region with a wax and ink (4:1) mixture, and were marked in female lots in order to identify females in estrous. After ten days of breeding season onset, rams were again marked with the same wax and ink mixture, but with a different ink color. Pregnancy diagnosis was performed on day 30 by ultrasonography and confirmed on day 60 after the last mating. The statistical analysis was performed using SAS, version 8. Differences of 5% (P < 0.05) or lower were considered significant. The results show that estrous synchronization in the semiarid region in both breeds was detected in 10% of females. The total pregnancy on first service was 45.00% and on second was 52.94%, with 85.18% of singleton and 14.81% twin deliveries, with prolificacy de 1.15 ± 0.38. In the Zona da Mata region 10% Santa Inês and 15% Morada Nova females had synchronized estrous (P > 0.05). The total pregnancy was 42.50% on first, 64.70% on second service and total delivery was 86.20% singletons, 12.06% twins and 3.33% triples with prolificacy of 1.15 ± 0.31. On both Semiarid and Zona da Mata regions, the majority of estrous events occurred between the11th and 15th day of the breeding season for Santa Inês ewes and between 6th and 10th day for Morada Nova ewes. Discussion: The occurrence of estrous, for both breeds, in both regions, were detected throughout the breeding seasons, despite most estrous detections were within the initial fifteen days, which normally happens with cycling pluriparous females, in disagreement with findings in the literature that young females display lower reproductive performance on the first breeding season. However, the sexual inexperience of young females is not equivalent to lack of male receptivity, since then, could not be responsible for late ...

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“…Nonetheless, this decreased response could be due to a decreased sexual stimulus from bucks. Recently, Luna-Orozco et al (2008) reported that nearly all nulliparous and multiparous crossbred goats in northern Mexico exposed to sexually active bucks exhibited estrus.…”

Section: Introductionmentioning

confidence: 99%

Effect of parity and progesterone priming on induction of reproductive function in Saanen goats by buck exposure

Véliz¹,

Meza-Herrera²,

Santiago-Miramontes³

et al. 2009

Livestock Science

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Parity of female goats does not influence their estrous and ovulatory responses to the male effect

Cited by 15 publications

References 22 publications

Duration of the breeding season on the reproductive performance of Anglo-Nubian goats during dry and rainy periods

Duration of the breeding season on the reproductive performance of Anglo-Nubian goats during dry and rainy periods

Role of Male effect on Reproductive Efficiency of Nulliparous Santa Inês and Morada Nova ewes raised in Different Regions

Effect of parity and progesterone priming on induction of reproductive function in Saanen goats by buck exposure

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