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Título

Effect of intake level during milk-feeding period and protein content in the post-weaning diet on performance and body composition in growing lambs

AutorManso, Teresa; Mantecón, Ángel R. ; Castro, Teresa; Iason, G. R.
Palabras claveBody composition
Dietary protein
Growth
Lambs
Milk
Fecha de publicación1998
EditorCambridge University Press
British Society of Animal Science
CitaciónAnimal Science 67: 513-521 (1998)
ResumenThe effect of intake level during the milk-feeding period and dietary protein content during the post-weaning period on performance, weight of components of the digestive tract and carcass and non-carcass chemical composition was investigated in 28 Churra lambs. A 2 X 2 factorial design was used with two intake levels during the milk-feeding period (L-milk: 0.9 and H-milk: 1.5 MJ gross energy per kg M-0.75 daily) and two concentrate supplements (L-protein: barley grain and H-protein: barley grain plus 200 g/kg fish meal) during the post-weaning period. After selecting an initial slaughter group of four 2-day-old lambs, 12 lambs were assigned randomly to each of two intake levels during a 4-week milk-feeding period and given food individually. Four lambs from each intake level were slaughtered at weaning (30 days old) and the remaining 16 were weaned between 30 and 49 days old (weaning period). Eight lambs from each nutritional regimen during the milk-feeding period were further divided into two equal groups and given food individually ad libitum with hay and the post-weaning concentrate, according to the experimental design until the final slaughter weight (20 kg) (post-weaning period). L-milk lambs showed a capacity to grow as well as the H-milk during the weaning and post-weaning period and there were no differences (P > 0.05) in dry-matter intake and food conversion ratio among treatments. Before weaning, the weight of the reticulo-rumen was not affected by the intake level during the milk-feeding period. The most affected component of the gastrointestinal tract tons the small intestine as proportion of the digestive tract which was lower in L-milk lambs (P < 0.05). At 20 kg live weight, the relative size of the reticulo-rumen was greater (P < 0.01) and the abomasum (P < 0.05) and large intestine (P < 0.01) were smaller in lambs which were given the H-protein concentrate after weaning. The organic matter apparent digestibility (OMD, P < 0.05) and crude protein apparent digestibility (CPD, P < 0.05) of the post-weaning diets was greater in L-milk lambs and the H-protein post-weaning diet was associated with a greater dry-matter apparent digestibility, OMD and CPD when lambs were close to final slaughter weight. At 20 kg live weight, the proportion of protein in the carcass of L-milk lambs was greater (P < 0.05) than in H-milk lambs. The greater growth of the reticulo-rumen of the L-milk lambs might have increased solid food intake after the milk-feeding period, led to greater CPD of post-weaning diets and had consequences in terms of carcass composition.
Descripción9 pages, 7 tables.
Versión del editorhttp://www.bsas.org.uk/downloads/Vol67Part3_Dec_1998.pdf
URIhttp://hdl.handle.net/10261/13290
ISSN1357-7298
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