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Ally, K*, Mercy, A. D. and Viswanathan , T.V. (2007). Indian Journal of Animal Nutrition. 24(2):84-87.
Abstract:
A study was conducted to assess the influence of level of dietary protein on early lactation using eighteen crossbred cows within one week of their lactation. These animals were grouped into three and fed with concentrate mixtures having 26.6 (T1), 20 (T2) and 16.9 (T3) per cent CP on DM basis and paddy straw, in the ratio 70:30 of total DM intake. The total dry matter intake (DMI) of animals in the T1 group was lower (P<0.01) than that of the other two groups. There was no significant difference in the milk production, milk composition or blood parameters except blood urea nitrogen, among the groups. The blood urea nitrogen levels of the 50th day collection were significantly higher (P< 0.01) in the T2 group than that of the T3 group. Rumen pH and lactic acid content were higher (P< 0.05) in T1 group while NH3-N concentration was lower (P< 0.05) for the animals fed T3 ration. The digestibility coefficient of EE, CF, NDF and ADF were significantly higher (P< 0.01) for the T1 ration. The cost of producing one kg milk was Rs. 7.79, 7.91 and 7.71 for the three groups, respectively. Results of the study suggested that CP level of 16.9 per cent in the concentrate mixture (13.2 per cent in the total ration) was sufficient to meet the requirements of cows in early lactation, producing a peak of 10 kg milk per day.