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Effect of lactation period duration on milk production of cows and its correction to normal 305 day lactation



Effect of lactation period duration on milk production of cows and its correction to normal 305 day lactation



Zhivotnov"dni Nauki 23(9): 9-15



A study was conducted on the effect of the lactation period duration on milk production. Consequently, an equation was derived for correction of prematurely concluded and of prolonged beyond 305-day periods to normal lactation. To that purpose milk production control data were used, obtained from 3801 purebred Holstein-Friesian cows in first lactation and from F1, R1 and R2 cows. Data were elaborated with the statistical method of variance applying a monofactor dispersion analysis for estimation of variances, a regression model and an arbitrary optitization of the estimated parameters. Milk production was corrected using the following equation: .**GRAPHIC**. where y-corrected milk production to normal 305-day lactation period; x1-milk production during the respective lactation period (in kg); x2-duration of the lactation period (in days); 1000, 85 and 3 = estimated constants. The deviation of the corrected average milk production value from milk production value of normal lactation in the interval 240-305 day varied in the range of +684.81 kg and +3.80 kg and the standard deviation in the range of +170.19 kg and -2.90 kg, respectively. The continuance of the lactation period has a highly significant effection milk production of normal and corrected lactation, whereas the strength of this effect reduced from 10% to 1%. The derived equation provided possibilities for obtaining comparable data of milk production during a lactation period that could be used for selection purposes in dairy cattle breeding.

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