Influência da idade e do número de ciclos estrais prévios à primeira inseminação na eficiência reprodutiva de matrizes suínas

• Autor(a) principal: Rodrigues, Ana Clara Fidélis
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5139
• topic: Suínos; Marrãs; Parâmetros reprodutivos; Pigs; Gilts; Reproductive parameters; CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA::REPRODUCAO ANIMAL

In pig farming, gilts represent the highest percentage of females within a farm producer and those with a greater number of born in the first farrowing tend to have a greater number of born during their lifetime. The present study investigated the influence of age and the numbers of estrus to first mating (from the second) and age at first estrus on reproductive performance of sows at first farrowing. Were evaluated gilts of the lineage Camborough ® 25, born between 2007 and 2012, from seven commercial farms situated in Ponte Nova MG. Data were obtained from databases of management programs PigChamp and Agriness. The size of the first litter was not influenced (P>0,05) by age at first insemination, age at first estrus and by the number of estrus in which the female was inseminated the first time, in the seven farms. The repetition rate of estrus also was not influenced by age at first insemination. It is conclude for lineage evaluated, that the repetition rate of estrus and the litter size at first farrowing are not influenced by age at first estrus, as well as by age and number of estrus at first insemination. In view of these considerations, gilts should be inseminated as from the second estrus, aiming a smaller period of nonproductive days, without commitment of reproductive efficiency.