Estimatian of individual and maternal heterosis and genetic parameters for production traits in holstein-indigenous crossbred cows of Iran

Moradi-Shahrbabak M., . and Rokoei M., . and Torshizi R. Vaez, . and Molasalehi M., . (2004) Estimatian of individual and maternal heterosis and genetic parameters for production traits in holstein-indigenous crossbred cows of Iran. [Proceedings Paper]

This study used 8551 and 7665 milk production records derived from 1314 and 1178 crossbed CB and indigenous IND cows for evaluation. Records were gathered during 1991 to 2000 in Isfehan province by the Iranian Animal Breeding Center IABC. Data were analyzed using single and repeated record animal models with derivative- free restricted maimum likelihood DF-REML method. The adjusted means for milk and fat yield in FICB IND and first backcross to Holstein BC1H cows were 1531.9 37.1 and 60.3 1.4 2228.1 54 and 77 1.9 and 2662.3 120.7 and 103.3 4.4 respectively. Results showd that lactation herd and year-season factors affected milk and fat yield significantly. Cows with 75 of Holstein genes had higher least squared means for milk and fat yield than the others. The effects of Holstein breed individual and maternal heterosis were estimated 20.86 11.85 and 5.05 kg for milk yield and 0.172 414 and 0.293 kg for fat yield respectively. Estimated heritability and repeatability were 0.37 0.03 and 0.33 0.005 0.35 and 0.43 0.03 and 0.37 0.02 and 0.38 for milk and fat yield respectively in single and repeated record models.

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Abstract

This study used 8551 and 7665 milk production records derived from 1314 and 1178 crossbed CB and indigenous IND cows for evaluation. Records were gathered during 1991 to 2000 in Isfehan province by the Iranian Animal Breeding Center IABC. Data were analyzed using single and repeated record animal models with derivative- free restricted maimum likelihood DF-REML method. The adjusted means for milk and fat yield in FICB IND and first backcross to Holstein BC1H cows were 1531.9 37.1 and 60.3 1.4 2228.1 54 and 77 1.9 and 2662.3 120.7 and 103.3 4.4 respectively. Results showd that lactation herd and year-season factors affected milk and fat yield significantly. Cows with 75 of Holstein genes had higher least squared means for milk and fat yield than the others. The effects of Holstein breed individual and maternal heterosis were estimated 20.86 11.85 and 5.05 kg for milk yield and 0.172 414 and 0.293 kg for fat yield respectively. Estimated heritability and repeatability were 0.37 0.03 and 0.33 0.005 0.35 and 0.43 0.03 and 0.37 0.02 and 0.38 for milk and fat yield respectively in single and repeated record models.

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Item Type:	Proceedings Paper
Additional Information:	Summary En
AGROVOC Term:	CROSSBREDS
AGROVOC Term:	COWS
AGROVOC Term:	LAND RACES
AGROVOC Term:	HETEROSIS
AGROVOC Term:	MILK YIELD
AGROVOC Term:	HERITABILITY
AGROVOC Term:	GENETIC INHERITANCE
AGROVOC Term:	GENETIC PARAMETERS
AGROVOC Term:	EVALUATION
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16350

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