| Autor: |
WANG Jian-dong, TANG Yu-lin, HOU Peng-xia, KANG Xiao-dong, YU Yang, SHI An, LIANG Xiao-jun |
| Zdroj: |
Feed Research; 2023, Vol. 46 Issue 10, p5-8, 4p |
| Abstrakt: |
The experiment was conducted to investigate the effect of different dietary crude protein levels on growth performance, serum biochemical indexes and reproductive performance of postpartum Angus cows. A total of 24 healthy and similar postpartum Angus cows with an average body weight of (480±20) kg were selected and randomly divided into three groups, with eight replicates in each group and one cow in each replicate. The cows were fed with the diets with crude protein levels of 11.78% (group I), 13.51% (group II) and 15.43% (group III), respectively. The pre-trial period was 10 d, and the formal trial period was 60 d. The results showed that there was no significant difference in initial weight and final weight among the three groups (P>0.05), the average daily gain in group II was significantly higher than that in group I and group III (P<0.05), and the feed to gain ratio significantly higher than that in group I and group III (P<0.05). The content of TP and BUN in serum in group II and group III were significantly higher than those in group I (P<0.05). The IgG content in group III was significantly higher than that in group I and group II (P<0.05). The content of IGF-1 and GH in group II were extremely higher than those in group I (P<0.01). The survival rate of calves in group II was the highest. The experiment indicates that the 13.51% crude protein level in diet can improve the growth performance, some serum biochemical indexes and reproductive performance of postpartum Angus cows under the conditions of the experiment. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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