Cow productivity index depending on their linearity

Abstract

The studies were carried out in “Tubinsk” JSC, Krasnoturansky district of the Krasnoyarsk Territory. Red-and-white cows of Reflection Sovereign 198998, Vis Back Ideal 1013415, Pabst Governor 882993, Rosafe Sition 267150, Siling Trijun Rokit 252803 lines were taken as the object of the study. Milk productivity was taken into account and productivity index was calculated. It was identified that the cow index of productivity on the farm should be 1,200 and higher. However, the desired result was not achieved. According to the first lactation, the indicators of bulls’ daughters of lines R. Sovereign and P. Governor were most consistent with this value - 1.007 and 1.033, respectively. By the third lactation, the daughters of lines R. Sovereign and V.B. Ideal approached the desired value - 1.008 and 1.077, respectively. Cows of different lines with high milk production more often left the herd, which may indicate a low adaptive ability to technologies. The daughters of line R. Sovereign showed the highest milk productivity (P≥0.95), the mass fraction of fat in milk was higher in the daughters of the P. Governor line (P≥0.999), the mass fraction of protein was higher in the daughters of R.Sition (P≥0.999). Dairy cattle breeding at “Tubinsk” JSC appears to be profitable. The level of profitability depends on milk productivity and makes 61.9% in the daughters of R. Sovereign and 65.3% in P. Governors, respectively. To improve milk productivity and its quality indicators off-springs of bulls-producers of R. Sovereign and P. Governors lines should be used, as well as breeding to increase the adaptability to technology.