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Genetic Parameters and Accuracy of recording Dry Matter Intake in first parity Holstein-Friesian cows

Thursday, August 21, 2014
Posters (The Westin Bayshore)
Coralia I. V. Manzanilla Pech , National Research Institute of Forestry, Agriculture and Livestock, Mococha, Yucatan, Mexico
Roel F. Veerkamp , Animal Breeding and Genomics Centre, Wageningen University, Wageningen, Netherlands
Mario P. L. Calus , Animal Breeding and Genomics Centre, Wageningen UR Livestock Research, Wageningen, Netherlands
Jennie E. Pryce , Biosciences Research Division, Department of Environment and Primary Industries, Victoria, Australia
Yvette de Haas , Animal Breeding and Genomics Centre, Wageningen UR Livestock Research, Wageningen, Netherlands
Abstract Text: A total of 30,483 records for dry matter intake (DMI) recorded between 1990 and 2011 were available from 1,273 Dutch Holstein-Friesian first-parity cows. Genetic parameters were estimated for the first 324 days in milk (DIM) using random regression models. Estimated heritabilities for DMI ranged from 0.21 to 0.40 across lactation, being highest between 80 and 205 DIM. Entire lactation heritability was 0.46. Genetic correlations between DMI in early lactation and during the rest of the lactation were negative (-0.5), and were most positive between DMI in mid lactation and during the rest of the lactation (0.80). Dry matter intake was genetically different across lactation, especially in early and mid lactation. Accuracies of selection for the entire lactation for DMI were 0.58, 0.47 and 0.33, when it was measured for 15, 10 or 5 weeks, respectively and best recording periods were during mid and late lactation.

Keywords:

Feed-intake

Genetic-correlation

See more of: Posters: Genetics of Trait Complexes - Feed Intake and Efficiency (Group 1)
See more of: Genetics of Trait Complexes: Feed intake and efficiency
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