Prognosis Of Dietary Glycine Needs Of Replacement Chicks
Abstract
M. J. Kryvenok, I. I. Ilchuk, V. M. Mykhalska
An effective level of glycine in the diets of replacement chicks has been experimentally established at different periods of their breeding. The influence of different levels of glycine in the mixed fodders of replacement chicks on their growth and development was investigated. It was established that replacement chicks with effective level of glycine in their rations at the end of the growing period had more weight by 167 g than chicks from the control group; this value was nevertheless within the limits recommended by the developer of the cross. We also studied the influence of different glycine levels in mixed fodder of young egg chicks on the digestibility of the nutrients, the balance of nitrogen and amino acid during the whole period of chicks’ growth. It was established that the optimum level of glycine in different growing periods contributed to an increase of protein digestion by 2 percent, fat – 2 percent, fiber – 2 percent, and BER – 1 percent, compared to the control birds. The chicks’ balance of nitrogen was studied and its positive trend was registered for the poultry of all groups. Reducing the amount of glycine in chicken diets as well as its excess leads to a decrease of nitrogen contamination in their bodies. The level of glycine content in chick bodies negatively correlated with its content in the diet. This level was the smallest in animals with excessive levels of glycine in their diet, which in turn led to a decrease in its absorption. Based on the patterns of dietary glycine needs of chickens throughout the entire period of their breeding and its effect on their growth, development, digestibility of nutrients in the body, and balance of nitrogen and investigated amino acids, we calculated the linear regression equation that can be applied in the operational control or in composing of the poultry diet.
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