Korean Journal of Animal Reproduction (한국가축번식학회지)
- Volume 10 Issue 1
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- Pages.49-57
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- 1986
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- 1226-5284(pISSN)
The Use of Radioimmunoassay to Moniter Reproductive Status of Cheju Native Cattle and the Effect of Su, pp.ementary Feeding on Reproduction 1. Body Weight Changes, Breeding Performances and Progesterone Levels from Weaning until First Calving
- Chung, D.C. (Radioisotope Research Institute Cheju National University) ;
- Kim, J.K. (Radioisotope Research Institute Cheju National University) ;
- Kim, D.C. (Cheju Experiment Station) ;
- Beak, Y.K. (Cheju Experiment Station) ;
- Moon, S.H. (Cheju Experiment Station)
- Published : 1986.05.01
Abstract
Studies were conducted to investigate the relationship between hormone leveles and nutritional levels for improving performance of Cheju native cattle. In June 1984 a trial was initiated using 8 Cheju native calves after weaning, fed at two su, pp.ementary feeding levels (NRC 100% and 70%). The body weight, breedng performence, change in progesterone level during pregnancy and estrus cycle were evaluated. Mean body weight at 6 months of age was 155kg when fed 100% NRC ration but it was only 137kg when heifers received the 70% NRC ration. At 10, 15 and 20 months of age the body weight was 66, 160 and 115kg, respectively, showing that heifers fed the standard ration gained weight rapidly (P<0.01). Average size of the lefe ovary in the standard group was 2.1
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