In order to study the effects of protein level and replacing soybean meal with cottonseed meal on fattening of beef cattle, diets with different protein levels and costs were prepared by replacing soybean meal with cottonseed meal based on meeting nutrient requirement of beef cattle. Forty healthy first-filial generation beef cattle (Japanese black cattle ♂×Luxi yellow cattle ♀) with similar age (average age was 28-month-old) and body weight were randomly divided into 4 experimental groups with 10 beef steers per group. The adjustment period lasted for 15 days, and the experimental period lasted for 240 days. The results showed as follows: compared with the group with the diet containing 12.8% protein, the daily gain of beef cattle in the group with the diet containing 14.8% protein was increased by 18.57% (P>0.05). The dressing percentage, meat percentage, rib fat thickness and backfat thickness of beef cattle fed 14.8% protein diet were significantly increased than those of beef cattle fed 12.8% protein diet(P<0.05 or P<0.01), but feeding 14.8% protein diet had no significant effect on the carcass meat percentage, eye muscle area, percentage of high-value cuts to live weight and meat-bone ratio (P>0.05). Under the same protein level, partial or whole replacing soybean meal with cottonseed meal had no effect on the daily gain and carcass traits of beef cattle (P>0.05), but the unit price of diets and costs of per kilogram of weight gain in cottonseed meal group were lower than those in soybean meal group. In conclusion, using cottonseed meal instead of soybean meal in the later stage of fattening of beef cattle is viable to reduce feeding costs. The demand of protein level for beef cattle recommend by current Feeding Standard of Fattening of Beef Cattle (2004) is lower than that for first-filial generation cattle (Japanese black cattle ♂×Luxi yellow cattle ♀) in this experiment.
JING Yuanqiang
,
SONG Enliang
,
CHENG Haijian
,
LIU Xiaomu
,
ZHAO Hongbo
,
LIU Guifen
,
TAN Xiuwen
,
YANG Weiren
,
WAN Fachun
. Effects of Dietary Protein Level and Replacing Soybean Meal with Cottonseed Meal on Fattening of Beef Cattle[J]. Chinese Journal of Animal Nutrition, 2012
, 24(6)
: 1062
-1068
.
DOI: 10.3969/j.issn.1006-267x.2012.06.010
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