Idade de desmame de cordeiros deslanados para terminação em confinamento, no litoral norte da Bahia

Abstract

RESUMO -Trinta e dois cordeiros (16 machos e 16 fêmeas) deslanados mestiços de Santa Inês, criados com as matrizes em pastagem de Brachiaria humidicola e suplementados em creep-feeding no período noturno, foram distribuídos em delineamento inteiramente casualizado, em esquema fatorial 4x2 -quatro idades de desmame (56, 70, 84 e 98 dias) e sexo, com o objetivo de determinar a melhor idade para o desmame desses animais. Ao desmame, os cordeiros foram confinados, até completarem 126 dias de vida, em baias individuais, onde receberam feno de Tifton 85 (Cynodon spp. cv Tifton 85), água e sal mineral ad libitum e ração concentrada na proporção de 2% do peso vivo. Houve efeito significativo da interação dos fatores idade de desmame e sexo sobre GPC e GPD, em que os cordeiros desmamados aos 84 dias foram superiores às cordeiras desmamadas com a mesma idade. Não se observou efeito significativo na interação dos fatores idade de desmame e sexo sobre GPND e CAC. Verificou-se efeito quadrático da idade de desmame para as variáveis GPND, GPD e CAC. Não se observou efeito significativo do sexo em nenhum dos parâmetros avaliados. A idade de desmame de 76 dias proporcionou maximização dos parâmetros GPND e GPD, enquanto a CAC mais eficiente foi observada nos animais desmamados aos 72 dias.Palavras-chave: alimentador restrito, Brachiaria, conversão alimentar, ovino Weaning Age on Fedlot Hair Sheep Lambs Performance in the Northern Litoral of BahiaABSTRACT -Thirty-two crossbred Santa Inês hair sheep lambs (16 males and 16 females) bred with their female progenitors on pasture of Brachiaria humidicola grass, supplemented in creep-feeding during the night, were allotted to a completely randomized design, in a factorial arrangement 4 x 2, four weaning ages (56, 70, 84 and 98 days) and sex to determine the best weaning age. At weaning, the lambs were confined in individual pens until 126 days old, when were daily fed Tifton 85 hay, water and mineral salt ad libitum and concentrate diet in the proportion of 2% body weight. There was a significant effect of weaning age vs sex interaction on DWC and DWG, where the males weaned at 84 days old were heavier than the females. No significant interaction of weaning age vs sex on DWBW and CFC was detected. Quadratic effects of weaning age on DWBW, DWG and CFC were noticed. No significant effect of sex on any of the studied parameters was detected. Seventy-six days weaned lambs maximized DWBW and DWG, while the most effective CFC was observed in seventy-two days weaned animals.

Effects of weaning age and weight on lamb growth rate of Morada Nova breed raised in a tropical extensive production system

“…FREITAS et al (2005) have shown, in Santa Inês hair breed which were weaned at 56 and 98 days, ADG of 143g and 150g in lambs slaughtered at 126 days of age, while MULLER et al (2006) reported ADW of 182 g and 183 in lambs weaned at 35 and 42 days and slaughtered with 28kg of liveweight.…”

Lamb Feeding Strategies During the Pre-Weaning Period in Intensive Meat Production Systems

“…Therefore, the decision on the most appropriate time and conditions under which weaning should be carried out is of great importance for successfully anticipating weaning (Coimbra Filho, 1992). Different ages have been reported as "ideal" for weaning; earlier literature recommends weaning from 75 to 94 days (Oliveira et al, 1996), but more recent studies have suggested that weaning can be performed earlier at 34, 35, 42, 56 or 62 days (Bôas et al, 2003;Freitas et al, 2005;Müller et al, 2008). However, it is worth noting that the results obtained with different weaning ages depend on nutritional support provided to the animals, and it is essential to supplement infants with use of creep feeding from the second week of life (Siqueira, 2000).…”

“…On the north coast of Bahia, Santa Inês crossbred lambs were evaluated by Freitas et al (2005) as to the best age for weaning: 56, 70, 84 or 98 days. Lambs were kept with the ewes in Brachiaria humidicola paddocks during the day and were then collected at 5 pm into barns equipped with creep feeders, where lambs had access to a corn and soybean meal concentrate (19% crude protein and 75% TDN).…”

Avaliação do ganho em peso de cordeiros da raça Santa Inês no periparto criados na região do Planalto Central brasileiro

“…As médias para peso ao nascer encontradas nesse estudo estão próximas aos 3,68 kg e 3,85 kg, registrados pro Freitas et al (2005) Tendo em vista o peso e ganho médios até os 60 dias, Freitas et al (2005) avaliando cordeiros em pastagem e com acesso ao alimento privativo das 17:00 às 7:00 (creep-feeding-noturno), encontraram (P60) de 13,53 kg, com GMD de 0,161. Esses resultados foram muito semelhantes aos encontrados por Siqueira et al (1993) os quais observaram ganhos para SOUZA, A.J.…”