Effect of different nutrition on ewes' milk yield and its components
2000
Kica, J. | Margetin, M. | Margetinova, J. | Ochodnicky, D. (Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic))
A trial was conducted to determine the effect of different planes of nutrition on ewes' milk yield and its components during suckling by 62nd day of lactation and for the whole lactation. Bulk feed rations were identical in all groups, amounts of feed mixture were different. The trial comprised 3 groups of ewes of Tsigai (C) breed and Improved Wallachian (ZV) breed at a 1:1 ratio. The live weight of ewes did not decrease in any group during the trial. The higher plane of nutrition in the first four weeks of lactation increased dry matter and fat content in milk (P0.001). Experimental ewes with twins had higher milk yield by 20.1%. Group 1, which received 0.65 kg feed mixture per head/day, had average milk yield of 91.35 l by 62nd day of lactation, until lamb weaning, while group 2 receiving 0.5 kg feed mixture during the whole trial had average production of 90.53 l milk. Group 3, which received 0.30 kg feed mixture at the beginning of lactation and 0.65 kg in the second half of lactation, showed the lowest milk yield on average (71.74 l only). The ewes of group 1, 2 and 3 produced on average 146,769 l, 141,783 l and 120,363 l milk, respectively, for the whole lactation. The low plane of nutrition in the first five weeks of lactation in group 3 ewes had negative impacts on their efficiency even in 8 weeks after the plane of nutrition was normalized.
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