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Comparative performance of six Holstein-Friesian x Guzera grades in Brazil. 10. Disposal value

R.L. Teodoro^I; F.E. Madalena ^II; A.M. Lemos^I; D.A. Anjos^III

^IEMBRAPA, Centro Nacional de Pesquisa-Gado de Leite, 36155-000 Coronel Pacheco, MG, Brasil
^IIEPAMIG, Departamento de Zootecnia, Escola de Veterinária, Universidade Federal de Minas Gerais, Caixa Postal 567, 30161-970 Belo Horizonte, MG, Brasil. Send correspondence to F.E.M.
^IIICNPq. Bolsista de aperfeiçoamento

ABSTRACT

The prices at disposal of 346 dairy females of six Holstein-Friesian (HF) x Guzera crossbred groups in 67 farms were analyzed by a least squares analysis of variance under either additive-dominance or group classification models, including the effets of region, farm, age and trimester of sale. For groups with 1/4, 1/2, 5/8, 3/4, 7/8 and > 31/32 HF fraction, the mean (+ standard error) price of females sold for beef at mean age 8.1 years was equivalent to 921 + 64, 901 + 85, 882 + 75, 798 + 81, 727 + 79 and 665 + 85 liters of milk, respectively. Corresponding prices of females sold for dairying at mean age 11.8 years were 921 + 150, 1093 + 93, 976 + 133, 1031 + 116, 929 + 137 and 408 + 200 milk equivalents (m.e.). Price for beef declined linearly -249 + 120 m.e. per unit of proportion of HF genes, while neither individual nor maternal heterosis were significant (P > 0.24). Price for dairying, on the other hand, was significantly affected by individual (636 + 210 m.e.) and maternal heterosis (217 + 106 m.e.), but not by the individual breed additive difference.

Keywords: Holstein-Friesian; Guzera; disposal value.

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