Effects of dietary NDF concentration on milk yield and composition in dairy goats in mid-late lactation
2007
Cannas, A.; Porcu, G.; Rubattu, R., University of Sassari (Italy). Dipartimento di Scienze Zootecniche | Bomboi, G., University of Sassari (Italy). Dipartimento di Biologia Animale
Fourteen Sarda goats in mid-late lactation were housed in individual pens where they received a common total mixed ration (TMR) during the preliminary period (21 d). During the experimental period (24 d) the goats were divided in two isoproductive groups and fed differentiated TMR: one group received a high NDF-low no fibre carbohydrate (NFC) total mixed ration, while the other received a low NDF-high NFC total mixed ration. These differences were achieved substituting ground corn and barley grains with beet pulp shreds and soybean hulls. Both diets contained 50 per cent of dehydrated chopped alfalfa on a DM basis. Soybean meal completed the diets. Dry matter intake was higher in the H-NDF group, while dietary energy intake and body weight variations did not differ significantly between the two groups. Milk yield was significantly higher in the L-NDF group, while milk protein and milk urea were higher in the H-NDF group. Milk fat concentration and somatic cell count did not differ between groups, while milk fat and milk protein yields were higher in the L-NDF group. These results are in clear contrast to what was previously observed in sheep, fed diets similar to the ones used here, in which H-NDF diets induced higher milk yield than L-NDF ones
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