Effects of dry season and year-round supplementation on reproductive performance and body weight of Guzera breed cattle and their crossbreeds grazing guinegrass (Panicum maximum Jacq.)
Keywords:
Beef cattle, Calving, Fertility, Guzera, SupplementationAbstract
Reproductive performance of 137 first calving Guzera (GU) females and their crossbreeds with Brown Swiss (PS), Nellore (NE), Chianina (CH) e Caracu (CA) (3/4GU1/4PS, 1/2NE1/4PS1/4GU, 1/2PS1/2GU, 1/2CH1/4PS1/4GU, 1/2CA1/2GU, 1/2CA1/4PS1/4GU) were evaluated in two experiments (1 and 2). The treatments were without supplementation, supplemented only during the dry season or supplemented all year-round. The impact of supplementation type was evaluate in the shrunk body weight (PVj) in the beginning and ending of the breeding season (EC) and at calving, and calving status and calving recurrence over two consecutive years. There was a significant and positive influence of supplementation on calving recurrence (P(X2) < 0.09), which enhanced the calving status from 42 to 62% for females that were supplemented during the dry season. Calving recurrence was greater for females that received supplement all year-around than those that were fed only during the dry season periods (70 vs 50%, respectively). Guzera females had consistently lower PVj in the beginning of the experiments (P < 0.05). In experiment 1, the PVj in the beginning of EC was lower for females with no supplementation (P < 0.05).The females GU and 1/2CH1/4PS1/4GU had lower PVj in the beginning and ending of the EC and at calving (P < 0.05), compared to females 1/2NE1/4PS1/ 4GU. In the experiment 2, there was an interaction between supplementation and time of EC (P < 0.06). We concluded that there are significant effects of supplementation in the breeding and weight gain performance of females GU e their crossbreds with NE, CA, PS, and CH.
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