Estimates of genetic and crossbreeding parameters for 305-day milk yield of Girolando cows.

The objective of this work was to evaluate the effects of breed and heterosis on the estimates of genetic parameters of 305-day milk yield (305MY), by fitting milk yield data to the Wood, Mixed Log, Morgan, and Wilmink non-linear models. A total of 258,891 test-day milk yield records of 37,965 Holstein (H), Gyr (G), and Girolando (1/2 H, 1/4 H, 3/4 H, 3/8 H, 5/8H and 7/8H genetic groups) cows from 1840 herds were collected in the state of Minas Gerais, Brazil, in the period of 1998 to 2014. The pedigree file included 36,640 animals, 3677 bulls and 24,472 cows. The genetic parameters were obtained by one-character analysis using the AIREMLF90 software. The heritability estimates of 305MY, and of 305MY fitted to the different nonlinear models ranged from 0.14 to 0.20. Most genetic groups had heterosis effect, with the greatest effects for 305MY on 1/2H (1/2 Holstein 1/2 Gyr) cows, presenting a milk yield of 1112.73 kg higher than the average of their parents. The results indicate that most genetic groups of Girolando present heterosis effect for 305MY estimated through nonlinear models, and the possibility of obtaining moderate genetic gains when these animals are subjected to selection procedures.

Bibliographic Details

Main Authors:	DALTRO, D. dos S., SILVA, M. V. G. B., GAMA, L. T. da, MACHADO, J. D., KERN, E. L., CAMPOS, G. S., PANETTO, J. C. do C., COBUCI, J. A.
Other Authors:	DARLENE DOS SANTOS DALTRO, Universidade Federal do Rio Grande do Sul; MARCOS VINICIUS GUALBERTO B SILVA, CNPGL; LUIS TELO DA GAMA, Universidade de Lisboa; JULIANA DEMENTSHUCK MACHADO, Universidade Federal do Rio Grande do Sul; ELISANDRA LURDES KERN, Universidade Estadual do Oeste do Paraná; GABRIEL SOARES CAMPOS, Universidade Federal do Rio Grande do Sul; JOAO CLAUDIO DO CARMO PANETTO, CNPGL; JAIME ARAUJO COBUCI, Universidade Federal do Rio Grande do Sul.
Format:	Artigo de periódico biblioteca
Language:	Ingles English
Published:	2021-08-12
Subjects:	Heterose, Vaca Leiteira, Gado Leiteiro, Modelo Matemático, Bovino, Dairy cows, Heritability, Heterosis, Mathematical models,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133496 https://doi.org/10.1080/1828051X.2019.1702110
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