The relationship of hematological parameters with growth indicators of young laying hens

Abstract

The parent flock is updated by the introduction of the hatching egg or day-old chicks from the producing country. Renewal of the parent flock through the delivery of daily chickens reduces the stress resistance of this category of bird, which has a negative role in the morphophysiological status and growth of chickens. In the blood of two linear chickens (group I), the number of red blood cells was 3.25± 0.06 1012/l, hemoglobin 67.61 ± 2.49 g/l; Group II, the number of red blood cells in the peripheral blood was 3.80 ± 0.06 1012/l, hemoglobin 83.91±1.86 g/l. The red blood cells and erythropoiesis organs in the body of chickens obtained at the poultry farm (group II) were highly reactive, which allowed the body to quickly compensate for the lack of oxygen and metabolic substrates, and thereby restore the state of homeostasis. In chickens imported from Germany, the reactivity of the blood-forming organs was reduced, which was a consequence not so much of the linearity of the cross, but of the presence of transportation at the age of 1 day. Four linear chickens for the repair of an industrial herd grew better and more intensively. On day 40 they had a live weight of 85 g or 19.4% more than two-line chickens subjected to transport stress in the first days of life. Therefore, they reliably exceeded their peers from the first series in the indicator and other growth indicators (p≤0.01). The safety indicator in the first 5 days was higher in the group of four-line hybrids (repair young stock of the industrial herd) by 19.7%. Chickens from Germany had a low safety rate of only 66.7.