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Sheena Joseph, K. Ally, T.V. Viswanathan and K. S. Sujatha. (2007).
Abstract:
A study was conducted with crossbred cows to assess the effect of urea as a source of rumen degradable protein on the milk production in early lactation. Eight crossbred cows within 20 days of lactation were selected as uniformly as possible with regard to their age, parity, body weight and milk yield. They were allotted to the four dietary treatments in a switch over design. The four concentrate mixtures contained 16.93, 17.37, 19.92 and 19.92 per cent crude protein (CP) and 70.60, 69.24, 70.26 and 68.98 per cent TDN, respectively. The undegradable protein (UDP) levels in the four concentrate mixtures were 28, 39.15, 26.46 and 40 per cent of CP, respectively, on DM basis. All the four dietary treatments contained one per cent urea as source of RDP. There was no significant effect (P>0.05) of dietary CP or UDP levels on the body weight, dry matter intake and milk yield of animals. The inclusion of urea at different CP or UDP levels did not show any marked influence on the production performance of the animals. There was no significant difference in any of milk composition parameters except MUN, which was significantly higher (P<0.05) with 20 per cent CP concentrate mixture compared to 17 per cent CP concentrate mixture at both levels of degradability. It was concluded that a 17 per cent CP concentrate mixture at both levels of degradability. It was concluded that a 17 per cent CP concentrate mixture with 28 per cent UDP was sufficient for meeting the protein requirement of early lactating crossbred cows producing about 10 kg milk per day. The study also revealed that one per cent urea can be added in the concentrate mixture of early lactating cows as a source of RDP without any deleterious effect.