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2.
J Dairy Sci ; 81(4): 958-65, 1998 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-9594384

RESUMEN

This study evaluated the effects of recombinant bovine somatotropin (bST; one injection of 320 mg per ewe) on milk production and composition and on the grazing behavior of multiparous ewes in the third to fourth lactation. Forty Comisana lactating ewes were divided into four groups: 1) untreated, grazing on natural pasture (botanical composition: 35% of Graminaceae, 49% of Fabaceae, 6% of Cruciferae, 10% of other families) at a low stocking rate (16 m2/d); 2) untreated, grazing at a high stocking rate (8 m2/d); 3) treated with bST, grazing at a low stocking rate; and 4) treated with bST, grazing at a high stocking rate. The diets of the ewes were supplemented with vetch and oat hay (500 g/d) and with concentrate (500 g/d). Treatment increased milk production (923.8 vs. 669.5 g/d) but had little effect on fat and protein contents. Administration of bST significantly increased herbage intake; the effect on intake was more marked at the high stocking rate. Under these grazing conditions, the treated ewes reduced selective intake behavior and, thus, achieved good feed intake despite the low biomass availability.


Asunto(s)
Ingestión de Alimentos/efectos de los fármacos , Hormona del Crecimiento/farmacología , Lactancia/efectos de los fármacos , Ovinos/fisiología , Alimentación Animal , Animales , Bovinos , Preparaciones de Acción Retardada , Dieta , Metabolismo Energético/efectos de los fármacos , Femenino , Hormona del Crecimiento/administración & dosificación , Lípidos/análisis , Leche/química
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