تعيين ضرايب تجزيه پذيري مواد خوراكي و مقايسه آنها با ضرايب جداول استاندارد AFRC در تغذيه گاوهاي شيرده هلشتاين

The determination of in situ protein degradability characteristics of some feedstuffs and comparing to AFRC standard tables in the feeding of lactating cows

In order to dairy cow diet formulation, the In situ protein degradation characteristics of some feedstuffs (barley grain, wheat bran, suyal, beet pulp, soybean meal, cottonseed meal and corn silage) was determined. In addition, in the second step, these parameters were compared to AFRC standard Tables in lactating cow diets containing alfalfa hay or alfalfa hay and silage (50:50). The results indicated that the cows fed with diets based on the present degradability coefficients had higher milk yield (kg/d), milk protein (g/d), milk NPN (g/l) and milk dry mater (g/d) (p<0.05), when compared to the other groups. It is also rioted that there is not significant differences between diets containing alfalfa hay or alfalfa silage (50:50).