Relationship between type traits of Ayrshire bulls and their daughters
https://doi.org/10.31043/2410-2733-2019-2-9-16
Abstract
It is necessary to determine through the correlation variability the direction of changes in the relationship between the signs of the exterior and milk yield in the process of age development of bulls and their daughters. Type traits of four age groups of 45 bulls taken at different periods of their life (12, 16, 18, 24, 36, 48 months), their daughters in the first lactation (8366 heads) were analyzed and founded relationship between the measurements of father - daughter and economically useful traits. Young bulls at the age of 7.2 years from the group (5 to 9 years) are the best in all measurements in all evaluation age periods the estimates exterior compared to other groups. High and reliable relationships were found for stature, body depth, girth of pastern and selectively for other measurements of bulls taken at different measurement times, which gives the right to predict the body type of animals during ontogenesis. Calculated 92 correlation coefficient of measurements of bulls and the same of daughters, as well as their milk yield, taking into account the age of the manufacturer and the date of measurement. Reliable correlation coefficients were obtained from the stature and body depth in bulls of different ages. The relationship measurements of a body of bulls with milk yield of their daughters in most cases low, but reliable (as a large number of daughters). Milk yield of daughters for 305 days of lactation significantly correlates with their body depth and girth of pastern 0,428*** and 0,307***. The relationship between mother and daughter on a number of exterior features is established. The largest - milk yield with stature 0,153 **, body depth 0,173 **, girth behind the shoulder blades 0,154 **, slanting body length 0,157 **. For daughters, milk yield for 305 days of lactation reliably correlates with their body depth and girth behind the shoulder blades 0.428 *** and 0.307 ***. The measurement of the body depth has been established: the body depth bull - daughters 0.156 **; body depth mother - daughter 0,707 **; body depth daughters with a yield 0.428 **; the body depth of bull with daughters milk yield 0.173 **.
Keywords
Ayrshire breed,
sires,
cows,
correlation coefficient,
exterior,
measurements,
age of bull,
evaluation date
About the Author
E. Vasileva
Russian Research Institute of Farm Animal Genetics and Breeding — Branch of the L. K. Ernst Federal Science Center for Animal Husbandry
Russian Federation
Russian Federation
PhD (Agr. Sci.), senior researcher, Laboratory of genetics and selection of Ayrshire cattle
St. Petersburg, 196601 Moscow highway, 55a
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Review
For citations:
Vasileva E. Relationship between type traits of Ayrshire bulls and their daughters. Genetics and breeding of animals. 2019;(2):9-16. (In Russ.) https://doi.org/10.31043/2410-2733-2019-2-9-16
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