Effects of bacitracin and chlortetracycline on laying performance and egg quality and approach to its mechanism in aging hens
In this research, 576 ROM laying hens of 300 days of age were randomly divided into three groups, each included four replicates of 48 layers. The layers were given a basal corn-soybean meal diet alone or supplemented 50 mg/kg bacitracin or 100 mg/kg chlortetracycline for a period of 90 days. Results...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Zhejiang University Press
2000-03-01
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| Series: | 浙江大学学报. 农业与生命科学版 |
| Subjects: | |
| Online Access: | https://www.academax.com/doi/10.3785/1008-9209.2000.02.0169 |
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| Summary: | In this research, 576 ROM laying hens of 300 days of age were randomly divided into three groups, each included four replicates of 48 layers. The layers were given a basal corn-soybean meal diet alone or supplemented 50 mg/kg bacitracin or 100 mg/kg chlortetracycline for a period of 90 days. Results indicated that adding bacitracin and chlortetracycline groups obviously increased daily mean laying rate (P<0.05), eggshell thicknes (P<0.01), relative eggshell weight (P<0.05) and decreased feed/egg ratio (P<0.05). But there had no significant effects on feed intake, egg weight, egg specific gravity, yolk index, egg shape index and Haugh score (P>0.05) respectively compared with control group. Futhermore, it was found that bacitracin and chlortetracycline supplementation apparently enhanced LH, FSH and PTH levels (P<0.05) in serum respectively. In addition, adding chlortetracycline promoted alkaline phosphatase significantly (P<0.05). |
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| ISSN: | 1008-9209 2097-5155 |