Altrenogest treatment effects on the reproductive performance of sows during transition to batch farrowing/Efeito do periodo de suplementacao com altrenogest no desempenho reprodutivo de femeas suinas em transicao para o manejo em bandas

• Published in: Ciência rural Vol. 50; no. 9; p. 1
• Main Authors: Corezzolla, Jose Luis, Ulguim, Rafael da Rosa, Gasperin, Bernardo Garziera, Rauber, Lucio Pereira, Bianchi, Ivan
• Format: Journal Article
• Language: English
• Published: Universidade Federal de Santa Maria 01-09-2020
• Subjects: Brasil
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20190806

The synthetic progestin altrenogest (ALT) has been widely used in sow farms to concentrate artificial inseminations (AIs) during the transition of weekly productive flow for the batch farrowing system of 14 or 21 days. The objective of the present study was to investigate the effect of the duration of ALT treatment on the reproductive performance of weaned sows during transition to batch farrowing. Retrospective data was evaluated regarding the reproductive performance of primiparous and multiparous sows that were either not treated (control, n = 165) or treatedwith 20 mg ALT during 7 days (ALT!, n = 161) or 14 days (ALT14, n = 199) post-weaning. The interval between weaning or the end of ALT supplementation and first AI did not differ among the groups, as well as the percentage of sows inseminated up to 7 or 10 days after the end of treatment or weaning (P>0.16). There was a tendency for a lower farrowing rate (P = 0.06) in ALT7 (77.2%) when compared to ALT 14 (84.5%) and control (86.3%) groups. The total number of piglets born did not differ among groups (P = 0.35). In conclusion, despite the slight delay in the estrus onset, the proportion ofestrous sows was not affected, whereas the adjusted farrowing rate was reduced when ALT was administered for 7 days after weaning in multiparous sows during transition to 21 days batch farrowing system. Key words: swine, animals, female, altrenogest, weaning. O progestageno sintetico altrenogest (ALT) tem sido amplamente utilizado na suinocultura para agrupamento da inseminagao, na transigao de fluxo produtivo semanal para manejo em bandas de 14 ou 21 dias. O presente estudo investigou o efeito da duragao do tratamento com ALT sobre o desempenho reprodutivo de femeas desmamadas na transigao para o manejo em bandas. Foram coletados dados retrospectivos do desempenho reprodutivo de femeas primiparas e pluriparas desmamadas (n = 525) que nao foram tratadas (controle, n = 165) ou tratadas diariamente com 20 mg de ALT durante 7 dias (ALT7, n = 161) ou 14 dias (ALT 14, n = 199) pos-desmame. O intervalo entre o desmame ou final da suplementagao de ALT e a primeira IA nao diferiu entre os grupos, bem como o percentual de femeas inseminadas ate 7 e 10 dias pos a remogao da suplementagao hormonal (P > 0,16). Houve urna tendencia para menor taxa de parto ajustada (P = 0,06) no grupo ALT7 (77,2%), quando comparada aos grupos ALT 14 (84,5%) e controle (86,3%). O numero total de leitoes nascidos nao diferiu entre os grupos (P = 0,35). Conclui-se que, apesar do pequeno atraso no inicio do estro, nao houve impactos na taxa de manifestagao estral. Entretanto, a taxa de parto ajustada foi reduzida quando o ALT foi administrado por sete dias apos o desmame na transigao para o manejo em bandas de 21 dias. Palavras-chave: suinos, animais, femea, altrenogest, desmame.