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- Title
DESEMPENHO PRODUTIVO DE VACAS GIROLANDO ESTIMADO PELO MODELO DE WOOD AJUSTADO POR METODOLOGIA BAYESIANA.
- Authors
Aberrachid Jacopini, Laís; Paes Barbosa, Severino Benone; Lino Lourenço, Daniela Andressa; Barbosa da Silva, Marcos Vinícius Gualberto
- Abstract
It were used the model of Wood analyzed by bayesian methodology to estimates the components of the lactation curve of different genetic groups, first (OP1) and second (OP2) order of birth: 1/4 Holstein - 3/4 Gir, 1/2 Holstein - 1/2 Gir, 3/4 Holstein - 1/4 Gir, 5/8 Holstein - 3/8 Gir and 7/8 Holstein - 1/8 Gir. Data for milk production to 305 days of lactation belongs to the Animal Science Archive Research Center National Dairy Cattle from the Brazilian Agricultural Research Corporation (EMBRAPA / CNPGL). After estimating the model parameters were calculated the peak production (PP), time at peak (TP), persistency of lactation (PER) and lactation length for each genetic group. OP1 animals had lower yields for all stages of lactation, and take longer to reach peak production. OP2 animals had higher total milk production. The total milk production of animals 7/8H-1/8G of OP1 was similar in animals 3/4H-1/4G 1/2H-1/2G. For OP2, the animals 7/8H-1/8G were the most productive, followed by 3/4H-1/4G and 1/2H-1/2G. Intermediate production was observed in animals 5/8H-3/8G and lower in animals 1/4H-3/4G for both orders of birth. There was no significant difference in lactation length among genetic groups. OP1 animals are more persistent than OP2 animals, however, they are most productive. The genetic groups studied are shown similar for the duration of lactation. The bayesian approach in adjusting the Wood's model allows accurate estimates lactation curve characteristics of the animals and the estimation of total milk yield, lactation length and persistence.
- Subjects
LACTATION in cattle; MILK yield
- Publication
Archives of Veterinary Science, 2016, Vol 21, Issue 3, p43
- ISSN
1517-784X
- Publication type
Article