Effect of feeding curves in performance and carcass characteristics of swine

• Ano de defesa: 2018
• Autor(a) principal: Lima, Gustavo Freire Resende
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: eng
• Instituição de defesa: Universidade Federal de Viçosa
• Palavras-chave em Português: Suínos - Alimentação e rações; Suínos - Crescimento; Suínos - Carcaças; Suínos - Registros de desempenho; Nutrição e Alimentação Animal
• Link de acesso: https://locus.ufv.br//handle/123456789/27076

This study aimed to evaluate the effect of feeding curves on the performance and carcass characteristics on grow to finish pigs. One thousand two hundred crossbred barrows weighing 25.32 ± 0.7Kg with 68 to 69 days of age, were randomly allotted to 1 of 4 weekly feeding curves throughout the growing period. The control feeding curve was calculated to meet or exceed the requirements for PIC’s genotype following an estimated daily growth curve (PIC 2016) for a cumulative average daily gain of 0.965Kg/day. The treatment control -5% was the amount of feed from the control feeding curve (control curve), minus 5% throughout the 96 days on feed. The treatment control +5% was the amount of feed from the control feeding curve (control curve), plus 5% throughout the 96 days on feed, and then the treatment Ad libitum access where the feeder coverage was managed at 30%. On the cumulative average daily gain, the control -5% fed pigs and the Ad Libitum fed pigs were the slowest and the fastest pigs all the grow to finish pigs respectively (p<.05). At day on feed 96 the Ad Libitum fed pigs grew 8.69% faster than control, followed by 2.2% faster growth than control by curve control +5%, but feeding curve control -5% pigs grew 3.96% slower that control (p<.05). Differences were found in feed conversion that the control -5% had the best feed conversion rate, -1.55% less than control, followed by control +5% and Ad Libitum access, +2.54% and +7.65% then control respectively. The Ad Libitum access had the heaviest hot carcass weight followed by control +5%, control and control -5% feeding curves (p<.05). There was a tendency (p<.10) that the Ad libitum access had a deeper loin than control +5% and there was a difference in loin depth between control -5% and control (p<.05). The control -5% had backfat thickness lower than control, control +5% and Ad Libitum access (p<.05). Ad libitum access feeding curve had thickest backfat among those feeding curves but control and control +5% did not show any difference (p>.05). For lean content, the Ad Libitum access feeding curve had the lowest (worst) lean content (p<.05) but there no differences between control -5%, control and control +5%. The control -5% produced the most efficient pig in feed conversion but the slowest in growth, lowest in backfat thickness and loin depth. Control feeding strategies alter the performance and carcass characteristics of grow to finish pigs. It can be an effective feeding practice, once the nutrients intake requirements are met, to improve feed conversion rate and it can be a tool to manage growth rate.