Idade à desmama e manejo alimentar na produção de cordeiros superprecoces
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Data
2003-12-01
Autores
Villas Bôas, Antonio Sérgio [UNESP]
Arrigoni, Mario de Beni [UNESP]
Silveira, Antonio Carlos [UNESP]
Costa, Ciniro [UNESP]
Chardulo, Luiz Artur Loyola [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Zootecnia
Resumo
O objetivo do presente trabalho foi verificar o efeito da suplementação das ovelhas sobre a época da desmama, na produção de cordeiros superprecoces e no ciclo reprodutivo da mãe. Foram utilizadas 66 fêmeas da raça Hampshire Down, com idade entre 3 e 4 anos, e seus respectivos produtos, mantidos em pastagem de gramínea e alimentados em creep-feeding com ração concentrada. As ovelhas foram distribuídas em suplementadas (n=34) e não suplementadas (n=32) durante a lactação. Os cordeiros foram distribuídos ao acaso em quatro tratamentos: T1- cordeiros desmamados aos 34 dias (n=16) com ovelhas suplementadas; T2 - cordeiros desmamados aos 62 dias (n=18) com ovelhas suplementadas; T3 - cordeiros desmamados aos 34 dias de idade (n=16), com ovelhas não suplementadas e;T4 - cordeiros desmamados aos 62 dias (n=16) com ovelhas não suplementadas. O delineamento experimental foi o de blocos ao acaso, com arranjo fatorial 2x2. Os cordeiros dos tratamentos T2 e T4 tiveram ganhos de peso significativamente maiores que os desmamados aos 34 dias (T1 e T3). O peso à desmama aos 62 dias foi significativamente maior nos cordeiros de mães não suplementadas e os cordeiros foram abatidos mais cedo que os de ovelhas suplementadas. Os rendimentos de carcaça e o índice de compacidade foram superiores nos cordeiros desmamados aos 62 dias. Não houve diferença significativa na gordura de cobertura. Houve efeito de suplementação das mães na maciez da carne dos cordeiros. Não houve diferença significativa nos pesos das mães à desmama, mas houve diferença entre o peso ao parto e à desmama . A suplementação materna e a idade de desmama, nas condições do experimento, não interferiram na capacidade reprodutiva das matrizes.
The objective of this experiment was to verify the effect of weaning age and ewe supplementation on the production of super-young lambs and on the reproductive cycle of dams. Sixty-six Hampshire Down ewes, ranging between 3 and 4 years of age, were kept with their lambs on grass pasture. All lambs were creep fed. The ewes were either supplemented (n=34) or not (n=32) during lactation. The lambs were randomly allocated to four treatments: T1 - weaned from supplemented dams at 34 days of age (n=16); T2 - weaned from supplemented dams at 62 days (n=18); T3 - weaned from not supplemented dams at 34 days (n=16); T4 - weaned from not supplemented dams at 62 days (n=16). A 2 x 2 factorial arrangement was used in a randomized block design. Lambs from T2 and T4 showed higher weight gains than those weaned at days 34 (T1 and T3). Weight at day 62 was higher and slaughter age lower in lambs weaned from not supplemented mothers. Carcass yield and compactness index were higher in the lambs weaned at day 62. Dam supplementation increased meat tenderness. No difference was observed in backfat thickness. No difference was observed in weight dams at weaning, but difference between body weight of dam at parturition and at weaning weight was observed. Neither dam supplementation nor lamb weaning age showed any effect on dam reproductive efficiency.
The objective of this experiment was to verify the effect of weaning age and ewe supplementation on the production of super-young lambs and on the reproductive cycle of dams. Sixty-six Hampshire Down ewes, ranging between 3 and 4 years of age, were kept with their lambs on grass pasture. All lambs were creep fed. The ewes were either supplemented (n=34) or not (n=32) during lactation. The lambs were randomly allocated to four treatments: T1 - weaned from supplemented dams at 34 days of age (n=16); T2 - weaned from supplemented dams at 62 days (n=18); T3 - weaned from not supplemented dams at 34 days (n=16); T4 - weaned from not supplemented dams at 62 days (n=16). A 2 x 2 factorial arrangement was used in a randomized block design. Lambs from T2 and T4 showed higher weight gains than those weaned at days 34 (T1 and T3). Weight at day 62 was higher and slaughter age lower in lambs weaned from not supplemented mothers. Carcass yield and compactness index were higher in the lambs weaned at day 62. Dam supplementation increased meat tenderness. No difference was observed in backfat thickness. No difference was observed in weight dams at weaning, but difference between body weight of dam at parturition and at weaning weight was observed. Neither dam supplementation nor lamb weaning age showed any effect on dam reproductive efficiency.
Descrição
Palavras-chave
cordeiros superprecoces, desmama, ovinos, reprodução, super young lambs, weaning, sheep, reproduction
Como citar
Revista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 32, n. 6, p. 1969-1980, 2003.