Abstract
Twenty eight multiparous lactating cows were utilized in an experiment to evaluate the response to an exogenous fibrolytic enzyme on their lactational performance during early lactation period (in terms of milk production, milk composition, feed intake, milking efficiency, body weight change) and the exact time of this response. Cows were randomized into two groups (14 each) with similar parities and were fed a concentrate ration of barley, ground corn, soybean meal, and wheat bran and roughage ration of alfalfa hay. One of the two groups was supplemented with the fibrolytic enzyme immediately after parturition up to 100 post partum. The experiment was of two phases with 50 days each. The enzyme, which has a cellulase/hemicellulase activity (derived from Trichoderma group), was added to the concentrate part of the ration in a dry powder form. Milk production, 3.5% fat corrected milk, energy corrected milk were higher (p<0.05) for cows fed treated diet. At the same time, No differences were observed in percentages of milk components, feed intake, body weight, body weight change, or rectal temperature for the whole experimental period or during any of the two phases. Efficiency of milk production was higher (p<0.05) for treatment group cows than for that of the control ones. However, efficiency was better during the second phase than during the first phase. Feeding enzyme treated diets to dairy cows improved lactational performance during early 100 day of the lactation period. However, the first 50 days of lactation looked to be the critical. (Asian-Aust. J. Anim. Sci. 2003. Vol 16, No. 5 :677-684)
Highlights
With similar parities and were fed a concentrate ration of barley, ground corn, soybean meal, and wheat bran and roughage ration of alfalfa hay
On the concentrate diet of growing feedlot heifers increased other hand, it is presumed that ruminal fibrolytic activity average daily gain by 9% and numerically improved feed to cannot be significantly increased by the addition of gain ratio by 10% but had no effect on dry matter intake exogenous enzymes because it is usually assumed that as (Beauchemin et al, 1999a)
Percentage components of milk, and yield of components of the whole 100 day experimental period and for each period are presented in production of actual milk yield, 3.5% fat corrected milk, or energy corrected milk for cows received enzyme treatment than those of the control
Summary
ABSTRACT : Twenty eight multiparous lactating cows were utilized in an experiment to evaluate the response to an exogenous fibrolytic enzyme on their lactational performance during early lactation period (in terms of milk production, milk composition, feed intake, milking efficiency, body weight change) and the exact time of this response. 3.5% fat corrected milk, energy corrected milk were higher (p
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