Effect of dietary by-products on milk production of dairy cows in early-lactation, 2: Evaluation of highly degradable fiber
2001
Satoh, S. (Aichi-ken. Agricultural Research Center, Nagakute (Japan)) | Kato, Y. | Ueda, J. | Suzuki, K.
To evaluate the dietary effect of highly degradable fibers from the by-products (BP), four groups of cows were fed different diets as the form of total mixed ration (TMR) through the first fifteen weeks postpartum. For high-BP group, TMR containing 21.6% (as fed basis) of BP (mixture of dried brewers grain, dried tofu cake and soy hulls) instead of grains (mixture of corn, soybean meal and cotton seeds) was fed. For molasses group, molasses beet was supplemented to high-BP diet to give more nitrogen cell wall free extract (NCWFE) source. For low-forage group, not only grains but also forages were replaced with brewers grain (as fed basis, totally 30.7% of the diet was replaced with BP). These three groups were compared with the low-BP group fed control diet. All diets contained similar level of CP (16.3-16.9%) and TDN (75.3-76.9% ). Milk yield seemed to be the highest for cows fed low forage diet, but the difference was not significant. Cows fed Low-BP diet produced highest milk fat but lowest milk yield. High-BP group yield sub-maximal milk but with less fat content of the milk. Cows fed TMR containing additional molasses had the lowest FCM yield. These results suggests highly degradable fibers in the BP can be used instead of starch in the grains. And the diet containing high amount of fibrous byproducts (45% NDF in dry matter basis) was acceptable for cows in early lactation without a resultant decrease in dry matter intake.
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