ESTIMATION OF GENETIC PARAMETERS FOR MONTHLY TEST DAY MILK PRODUCTION IN IRANIAN HOLSTEINS

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FARHANGFAR H.; REZAEI H.

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Journal Paper

Paper Information

Journal: THE SCIENTIFIC JOURNAL OF AGRICULTURE (SJA) Year:2008 | Volume:30 | Issue:4-A Page(s): 101-107

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Information Journal Paper

Title

ESTIMATION OF GENETIC PARAMETERS FOR MONTHLY TEST DAY MILK PRODUCTION IN IRANIAN HOLSTEINS

Author(s)

FARHANGFAR H. | REZAEI H. | Issue Writer Certificate

Keywords

GENETIC PARAMETERSQ3

COVARIANCE FUNCTIONQ3

IRANIAN HOLSTEINQ3

Abstract

In this study, a total of 179460 monthly test day milk records (thrice a day with 10 test day records for each cow) obtained from 17946 IRANIAN HOLSTEIN cows at first lactation and distributed in 287 dairy herds and calved between 1986 and 2001 were used to estimate GENETIC PARAMETERS of milk yields during the lactation period. An animal model implementing COVARIANCE FUNCTION methodology (orthogonal Legendre polynomials) was used for genetic analysis of monthly test day milk records. The results revealed that milk production of the second half of the lactation is on average more heritable than the first half of the lactation. The lowest and highest heritabilities were found for first (0.063) and seventh (0.299) month of lactation, respectively. The results also showed that genetic correlations among monthly test day milk yields decreased when the interval between them increased so that milk yields at first and last month of the lactation period had the lowest genetic correlation (0.398).

Cites

ESTIMATION OF GENETIC PARAMETERS FOR MILK TRAIT AT DIFFERENT MILKING TIMES FOR HOLSTEIN COWS OF KHORASAN RAZAVI USING A RANDOM REGRESSION TEST DAY MODEL

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APA: Copy

FARHANGFAR, H., & REZAEI, H.. (2008). ESTIMATION OF GENETIC PARAMETERS FOR MONTHLY TEST DAY MILK PRODUCTION IN IRANIAN HOLSTEINS. THE SCIENTIFIC JOURNAL OF AGRICULTURE (SJA), 30(4-A), 101-107. SID. https://sid.ir/paper/24794/en

Vancouver: Copy

FARHANGFAR H., REZAEI H.. ESTIMATION OF GENETIC PARAMETERS FOR MONTHLY TEST DAY MILK PRODUCTION IN IRANIAN HOLSTEINS. THE SCIENTIFIC JOURNAL OF AGRICULTURE (SJA)[Internet]. 2008;30(4-A):101-107. Available from: https://sid.ir/paper/24794/en

IEEE: Copy

H. FARHANGFAR, and H. REZAEI, “ESTIMATION OF GENETIC PARAMETERS FOR MONTHLY TEST DAY MILK PRODUCTION IN IRANIAN HOLSTEINS,” THE SCIENTIFIC JOURNAL OF AGRICULTURE (SJA), vol. 30, no. 4-A, pp. 101–107, 2008, [Online]. Available: https://sid.ir/paper/24794/en

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