GENETIC EVALUATION OF IRANIAN FIRST LACTATION HOLSTEIN COWS BASED UPON CRUDE AND ENERGY-CORRECTED TEST DAY MILK RECORDS

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MOHAMMADPANAH MAHSHID; FARHANGFAR HOMAYOUN; BASHTANI MOSLEM

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Journal: Journal of Animal Production Year:2016 | Volume:17 | Issue:2 Page(s): 183-197

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Information Journal Paper

Title

GENETIC EVALUATION OF IRANIAN FIRST LACTATION HOLSTEIN COWS BASED UPON CRUDE AND ENERGY-CORRECTED TEST DAY MILK RECORDS

Author(s)

MOHAMMADPANAH MAHSHID | FARHANGFAR HOMAYOUN | BASHTANI MOSLEM | Issue Writer Certificate

Keywords

BREEDING VALUEQ2

ENERGY-CORRECTED MILKQ2

GENETIC EVALUATIONQ2

HOLSTEIN COWQ2

TEST DAY MODELQ2

Abstract

Correlation between BREEDING VALUE of crude milk (CM) and ENERGY-CORRECTED MILK (ECM) was studied based on a total of 774,013 test day records belongs to 88,456 first-parity Holsteins dairy cattle calving during 1997-2009 in 165 herds (from six provinces). Genetic analysis of the traits was carried out by a fixed regression TEST DAY MODEL. In the model, effects of herd, calving year, production month, production age, type of cow genotype (grade or pure Holstein), sperm type, polynomial function, as well as additive genetic and permanent environmental random effects of the cows were included. Mean BREEDING VALUEs as the GENETIC EVALUATION is undertaken based on two traits were statistically significant (P<0.0001). Correlation between BREEDING VALUE of CM and ECM was the highest (0.92) when all the cows were selected based upon BREEDING VALUE for ECM and was the lowest (0.27) as 10 top cows were selected based upon BREEDING VALUE for ECM. It could be therefore concluded that in the case of using ECM instead of CM records, change in the ranking of the elite cows is appreciable.

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APA: Copy

MOHAMMADPANAH, MAHSHID, FARHANGFAR, HOMAYOUN, & BASHTANI, MOSLEM. (2016). GENETIC EVALUATION OF IRANIAN FIRST LACTATION HOLSTEIN COWS BASED UPON CRUDE AND ENERGY-CORRECTED TEST DAY MILK RECORDS. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), 17(2), 183-197. SID. https://sid.ir/paper/209068/en

Vancouver: Copy

MOHAMMADPANAH MAHSHID, FARHANGFAR HOMAYOUN, BASHTANI MOSLEM. GENETIC EVALUATION OF IRANIAN FIRST LACTATION HOLSTEIN COWS BASED UPON CRUDE AND ENERGY-CORRECTED TEST DAY MILK RECORDS. JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE)[Internet]. 2016;17(2):183-197. Available from: https://sid.ir/paper/209068/en

IEEE: Copy

MAHSHID MOHAMMADPANAH, HOMAYOUN FARHANGFAR, and MOSLEM BASHTANI, “GENETIC EVALUATION OF IRANIAN FIRST LACTATION HOLSTEIN COWS BASED UPON CRUDE AND ENERGY-CORRECTED TEST DAY MILK RECORDS,” JOURNAL OF ANIMAL PRODUCTION (JOURNAL OF AGRICULTURE), vol. 17, no. 2, pp. 183–197, 2016, [Online]. Available: https://sid.ir/paper/209068/en

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