2004
DOI: 10.1590/s0102-09352004000200016
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Estimates of correction factors for lactation length and genetic parameters for milk yield in buffaloes

Abstract: RESUMOEstimaram-se fatores de correção para produção de leite aos 90, 240, 270 e 305 dias de lactação e parâmetros genéticos e de ambiente da produção de leite ajustada para esses períodos de lactação, utilizando-se 3888 lactações de 1630 búfalas, controladas entre 1987 e 2001, em 10 rebanhos do Estado de São Paulo. Os parâmetros genéticos foram estimados por meio do método da máxima verossimilhança restrita, livre de derivadas, aplicado a um modelo animal com medidas repetidas. As estimativas de herdabilidade… Show more

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Cited by 15 publications
(12 citation statements)
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“…The general structure of the data is shown in Table 1. To obtain the cumulated 270-d milk yield, the lactations were adjusted using the method proposed by Tonhati et al (2004), and lactations with a length above 270-d were truncated at this point. Lactations shorter than 90 d were deleted.…”
Section: Methodsmentioning
confidence: 99%
“…The general structure of the data is shown in Table 1. To obtain the cumulated 270-d milk yield, the lactations were adjusted using the method proposed by Tonhati et al (2004), and lactations with a length above 270-d were truncated at this point. Lactations shorter than 90 d were deleted.…”
Section: Methodsmentioning
confidence: 99%
“…Milk, fat and protein yields are constantly monitored traits in herds integrated in milk test programs. The test-day milk yield (TDMY), defined as the total yield of a cow over a period of 24 h, replaces the milk yield in 305 days of lactation, as calculated by using formulas and extension factors (Tonhati et al 2004). Buffalo milk is characterised by a high percentage of fat and protein, which could be used to increase milk's added value, following the current tendency of the worldwide milk markets.…”
Section: Introductionmentioning
confidence: 99%
“…For the calculation of these yields, milk production is generally monitored at average intervals of 30 days and the production of one cow on each test day is called test-day (TD) milk yield. Cumulative yields for different lactation periods are calculated using estimated extension or adjustment factors, with accuracy of cumulative yield depending on the quality and quantity of the available test-day records (Tonhati et al, 2004;ICAR, 2008).…”
Section: Introductionmentioning
confidence: 99%