Studies on the Layer Diet for Meat-type Breeding Hen:1. Optimum Level of Dietary Protein

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This is the first report of the collaborative works with Saga, Kumamoto and Kagoshima Prefectural Poultry Stations and Nagasaki Poultry Research Center to search for the optimum composition of the layer diet for meat-type breeding hens.Six hundred and sixty-four 8-week-old White Plymouth Rock females hatched in spring 1969 were fed low-protein, high-energy grower diet ad libitum on alternative day until 24 weeks of age. Then, the pullets were divided into 8 lots in each of 4 stations and one of 4 experimental layer diets, containing 12, 15, 18 and 21% of crude protein, respectively, were fed to duplicated lots until 64 weeks of age. The level of total digestible nutrients in the experimental diets was kept constant at 66%.Average body weight of the pullets fed the grower diet containing 10% of crude protein and 76% of total digestible nutrients on alternative day was 1.89kg at 24 weeks of age, which corresponded to 63% of that of the pullets reared conventionally in each of the stations. The pullets took 7.11kg of the grower diet in average during 16 weeks of rearing period. Their average viability was excellent, being 97%.Laying performance of the pullets on each of the layer diets was essentially the same, except average body weight, which increased with increased level of dietary protein. Feed cost per hatching egg was the lowest on 15% crude protein layer diet and that on 12% diet was the next, although the difference was not significant statistically. The abdominal fat content of the hens at 68 weeks of age was almost constant regardless of dietary protein level, indicating no trouble by obesity.Optimum protein level of layer diet for meat-type breeder was suspected to be about 15%, which was somewhat lower than that for egg-type hen.
日本家禽学会の論文

Studies on the Layer Diet for Meat-type Breeding Hen:1. Optimum Level of Dietary Protein

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日本家禽学会 | 論文

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