Selection and genetic parameters of productivity of kazakh dromedary

Abstract

The studies of milk productivity of Kazakh dromedary Arun showed that within 210 days of lactation, milk yield reliably increased from the first to the fourth lactation with a consequent decrease. Within 210 days, milk yield in the first lactation was 1980.4±34.1 kg, in the second - 2417.1±29.5 kg, in the third - 2795.9±35.1 kg, in the fourth - 2814.2±22.3 kg, in the fifth - 2439.5±12.8 kg and in the sixth - 2025.3±25.8 kg. On the basis of these data, we think it is reasonable to select into the selection herd according to the first lactation. Within 7 months of the second lactation, selection herds of Kazakh dromedary selected sequentially according to the developed methods of selection had 2700.0 kg of milk, with fat content of 4.42% and protein content of 3.5%. The heritability estimate of the fat content in milk was h² = 0.64, protein content - h² = 0.48, milk flow rate - h² = 0.83, it indicates efficiency of using new selection methods.