Abstract
In swine, multiple artificial inseminations (AI) are commonly performed per estrus due to the long estrus duration. This observational study aimed to evaluate the association among the number of AI conducted per estrus, the estrus duration and the subsequent reproductive performance on a commercial swine farm. After evaluation of both estrus profile and follicle dynamics using ultrasound, by two independent teams, the number of AI per estrus was recorded, with no interference in the farm habitual management. The first AI was done at the time of estrus detection and subsequent AIs were done at 12 h intervals, as long as females showed estrus signs. The risk of conducting more than three AI per estrus as a function of estrus duration was also estimated. For females receiving two AI per estrus, farrowing rate (92.0%) was higher (p 0.05) for females receiving two, three or 4 to 6 AI per estrus (10.6, 12.0 and 12.0, respectively). For females having estrus longer than 78 horas, the odds of receiving 4-6 AI were 6.1 times higher than for those having estrus shorter than 50 hours, and 3.4 times higher than for those having estrus within 50 to 74 h (both p < 0.05). Thus, although long estrus duration allows multiple AI per estrus, we concluded that more than three AIs per estrus are not recommended because there is no benefit for subsequent reproductive performance. Keywords: Estrus duration, farrowing rate, litter size, swine.
Highlights
In swine, multiple artificial inseminations (AI) are commonly performed per estrus due to the long estrus duration
Long estrus duration allows multiple AI per estrus, we concluded that more than three AIs per estrus are not recommended because there is no benefit for subsequent reproductive performance
Este estudo foi realizado em uma granja comercial, localizada na região noroeste do estado do Rio Grande do Sul, com um plantel formado por 2.250 matrizes de uma mesma base genética
Summary
Marcus Vinicius Figueira de Alvarenga, Ivan Bianchi, Antonio Sergio Varela Júnior, Odirlei Calderam, Eduardo Schmitt, Marcio Nunes Corrêa, João Carlos Deschamps e Thomaz Lucia Jr.. É comum a realização de múltiplas inseminações artificiais (IA) por estro, em função da longa duração do estro. Este estudo observacional teve o objetivo de verificar a associação entre o número de IA realizada por estro com a duração do estro e o desempenho reprodutivo subsequente, em uma granja comercial. Compararam-se a taxa de parição e o tamanho total da leitegada em função do número de IA por estro. A taxa de parição das fêmeas que receberam duas IA (92,0%) foi maior (p < 0,05) do que a observada para fêmeas que receberam três (77,5%) ou quatro a seis IA (79,6%). O tamanho total da leitegada não diferiu (p > 0,05) entre fêmeas que receberam duas, três ou quatro a seis IA (10,6, 12,0 e 12,0, respectivamente). Palavras-chaveS: Duração do estro, taxa de parição, tamanho de leitegada, suínos
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
