Effect of non-genetic factors on milk production in Alpine goats
2000
Margetin, M. (Research Institute of Animal Production, Nitra (Slovak Republic)) | Milerski, M.
We used the data of milk recording from the years 1995-1997 to analyze the effect of non-genetic factors of surrounding on parameters of milk efficiency in Alpine goats (AG). We used a number of linear models with fixed effects (SAS-GLM). Dubious data were excluded from the analysis. We evaluated the effect of the factor herd (HE), lactation order (LO), control year (Year), season or month of parturition (MP), number of sucking kids (NSK), effect of associate variable SRO (HE x Year x MP) as well as of two concomitant variables on real and standardized production of milk (RPM, SPM) and on the length of milking period (LMP). We took 206 to 641 lactations into the analysis in dependence on the evaluated variable and the used model. We found out that the factors HE, LO, Year, SRO influenced RPM, SPM as well as LMP statistically very highly significant (P0.001). The factor MP influenced the milk production less but also statistically significant (P0.01 or 0.05). The factor NSK did not influence the studied parameters significantly. The variability of LMP (average 212 days) was conditional mainly on the factor HE, Year and MP. The estimated mean values (LSM) were 409.3 l RPM and 441.8 l SPM in the analyzed population of goats. RPM (225.8 l) was markedly higher in goats in 1st lactation compared with all other lactations (P0.01). The highest RPM was in goats in 5th lactation (501.8 l). Milk production in goats rose in dependence on number of sucking kids. We did not find linear or quadratic effect of concomitant variables (interval from parturition to 1st control measurement of milk - INT and LMP) on RPM and SPM
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