STUDY OF PRODUCTION, REPRODUCTION AND TYPE TRAITS IN A HOLSTEIN POPULATION

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PAHLAVAN R.; MOGHIMI ESFANDABADI A.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: JOURNAL OF ANIMAL SCIENCE Year:2010 | Volume:3 | Issue:3 Page(s): 1-12

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Title

STUDY OF PRODUCTION, REPRODUCTION AND TYPE TRAITS IN A HOLSTEIN POPULATION

Author(s)

PAHLAVAN R. | MOGHIMI ESFANDABADI A. | Issue Writer Certificate

Keywords

MILKQ2

REPRODUCTIONQ2

TYPE TRAITSQ3

HOLSTEIN OF IRANQ2

GENETIC TRENDQ2

Abstract

The main objective of the dairy farmers is the improvement of production. Selection for production traits can result in deterioration of fitness traits (like udder disorders). Therefore, the traits such as REPRODUCTION and conformation should be considered in breeding programs. The data of first lactation production, REPRODUCTION and conformation traits of two Agro-Industrial Holstein dairy farms in Tehran province were used to investigate the genetic and phenotypic parameters.The Animal Model consisted of herd-year-season of calving (fixed), animal and residual effects (random).The age at first calving was used as a covariate. The average of 305d-2x MILK and fat yield were 7019 (16) and 212.4 (0.6) kg, respectively. The average of fat percentage was 3.1 (0.01) percent. The average of calving interval was 407 (1) days. The average of age at first calving was 25.8 (0.02) months. The average of all conformation traits were within the range of values of Iranian Holstein cows. The heritability of MILK and fat yield, fat percentage calving interval and age at first calving were 0.27 (0.3), 0.17 (0.3), 0.32 (0.04), 0.02 (0.01) and 0.03 ( 0.01), respectively. The range of heritability estimates for conformation traits were 0.15 (chest width and rear leg side view) to 0.41 (stature). The genetic correlation between first lactation MILK yield and fat yield, fat percentage, calving interval and age at first calving were 0.72, -0.70, 0.17 and -0.03, respectively. There was a positive GENETIC TREND for all production and REPRODUCTION traits (except fat percentage). The GENETIC TREND for MILK yield was 59.6 kg per year and for fat percentage was -0.01 percent per year.

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APA: Copy

PAHLAVAN, R., & MOGHIMI ESFANDABADI, A.. (2010). STUDY OF PRODUCTION, REPRODUCTION AND TYPE TRAITS IN A HOLSTEIN POPULATION. JOURNAL OF ANIMAL SCIENCE, 3(3), 1-12. SID. https://sid.ir/paper/185945/en

Vancouver: Copy

PAHLAVAN R., MOGHIMI ESFANDABADI A.. STUDY OF PRODUCTION, REPRODUCTION AND TYPE TRAITS IN A HOLSTEIN POPULATION. JOURNAL OF ANIMAL SCIENCE[Internet]. 2010;3(3):1-12. Available from: https://sid.ir/paper/185945/en

IEEE: Copy

R. PAHLAVAN, and A. MOGHIMI ESFANDABADI, “STUDY OF PRODUCTION, REPRODUCTION AND TYPE TRAITS IN A HOLSTEIN POPULATION,” JOURNAL OF ANIMAL SCIENCE, vol. 3, no. 3, pp. 1–12, 2010, [Online]. Available: https://sid.ir/paper/185945/en

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