The effect of nutritional level on the performance and weight of hybrid layers of four genotypes
1998
Holoubek, J. | Arent, E. | Ledvinka, Z. (Ceska Zemedelska Univ., Prague-Suchdol (Czech Republic))
Performance (egg production, egg weight), feed consumption and body weight were studied in four gene combinations of laying hybrids of hens (102 - RIR x RIW, 201 - LB x RIR, 523 - slowly feathering RIR, 823 - quickly feathering RIR) from 155th to 407th day of layer age. Three feed mixtures with different nutrient levels were used. Feeding diet P2 with a crude protein content of 14.5 % resulted in the higher laying intensity than feeding diet P1 with a crude protein content of 16.3 %. The content of thio amino acids was approximately identical in both diets, but diet P2 had a higher proportion of lysine by 1.1 g/kg. The highest egg content was determined in hens receiving diet P2, and also in relation to the genotype. Every genotype responded to changes in the nutrient level of feed mixtures by different performance and body weight.
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