This experiment was conducted to investigate the effects of different levels of cotton stalk in diets on growth performance and reproductive performance of ewe. One hundred and twenty sheep were randomly assigned to six groups with ten sheep in each group by a single factor completely randomized design. The diet of control group 1 (group CK1) did not contain cotton source feed, and control group 2 (group CK2) contained cottonseed meal and without cotton stalk. On the basis of CK2 diet, the trial group diets were supplemented with 20% (group A), 30% (group B), 40% (group C) and 50% (group D) cotton stalks, respectively. The results showed as follows:1) no significant effect on dry matter intake and weaned weight were found with the increasing level of cotton stalk (P>0.05). 2) Total conception rate in group CK2 was higher than that in group CK1 by 3.92 percent point, and lower than that in groups B and D by 13.62 and 9.41 percent point. Reproduction rate in group CK2 was lower than that in group CK1 by 10.79 percent point; the reproduction rate in group B was higher than that in groups CK2, A, C and D by 52.01, 80.11, 67.89 and 27.89 percent point; litter size in group CK1 was higher than that in group CK2 by 0.11, and the litter size in group CK2 was higher than that in groups A, C and D by 0.24, 0.16 and 0.07; lambing rate in group CK1 was higher than that in group CK2 by 18.65 percent point; the lambing rate in group B was higher than that in groups CK2, A, C and D by 49.23, 70.47, 61.58 and 16.58 percent point. 3) No significant effect on birth weight of lambing was found with the increasing level of cotton stalk; triplet tube circumference in group CK2 was significant higher than that in groups B and D by 18.90% and 24.29%, respectively (P<0.01). Under this experimental condition, cotton stalk can be used as an roughage in ewe production. There are no significant effects on growth performance and reproductive performance of ewes, and there are no significant effects on birth weight and body size of lambs when the level of cotton stalks in the basal diet are 20% to 50%. There are no significant effects on birth weight and body size when cottonseed meal was added to diet of ewes, but it can reduce the litter size and male lamb ratio.
ZHANG Junyu
,
GUO Tongjun
,
SANG Duanji
,
ZHANG Zhijun
,
SU Lingling
,
WU Hongyan
. Effects of Cotton Stalk Level in Diets on Growth Performance and Reproductive Performance of Ewe[J]. Chinese Journal of Animal Nutrition, 2020
, 32(3)
: 1238
-1246
.
DOI: 10.3969/j.issn.1006-267x.2020.03.031
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