Portal de Periódicos da CAPES

Artigo Produção Nacional Revisado por pares

BIBTEX RIS

Dietary protein effects on and the relationship between milk production and mohair growth in Angora does

1999; Elsevier BV; Volume: 33; Issue: 1 Linguagem: Inglês

10.1016/s0921-4488(99)00003-6

1879-0941

T. Sahlu, Heloísa Carneiro, Hassan M. El Shaer, J.M. Fernandez, Steve Hart, A.L. Goetsch,

Rangeland Management and Livestock Ecology

Twenty-eight Angora does in week 3 through week 16 of lactation (with kids removed; 41 ± 0.9 kg initial BW) were given ad libitum access to a 67% concentrate diet with four formulated (DM basis) levels of CP ranging from 9% to 18% to study the relationship between, and dietary CP level effects on, milk production and mohair growth in different periods of lactation. Dry matter intake did not differ among treatments (p > 0.10) in all but one 2-week period, and CP intake increased linearly ( p < 0.01) with the increasing dietary CP concentration. Milk production increased linearly (P = 0.09) with increasing the dietary CP concentration (548, 605, 926, and 757 g/d; SE = 124). Mohair growth was 1.25, 1.37, 1.05, and 1.55 mg/(cm2 d−1) for 9%, 12%, 15%, and 18% CP, respectively (SE = 0.146). Within 2-week periods, CP intake was not related (p > 0.10) to mohair growth; however, intake of CP was fairly consistently correlated with milk production in each 2-week period (overall r = 0.59; p < 0.01). Milk production and mohair growth were negatively related for all data (r = −0.55; p < 0.01), although correlations in week 3–4, 15 and 16 of lactation were non-significant (p > 0.10). Dietary CP level did not markedly impact the negative relationship between milk production and mohair growth. In conclusion, milk production and mohair growth were inversely related in mid-lactation but not in early or late stages, and dietary CP level did not alter the relationship between milk production and mohair growth. Under these conditions, varying dietary CP level did not overcome partitioning of nutrients to milk synthesis or increase mohair growth by lactating Angora does.