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- W2340577420 abstract "× e - cn , where: y = weekly milk yield (kg), n = time post calving in weeks, a, b and c are constants and e is the base of natural logarithm. Analysis of covariance was used to examine the significance of effects of year (2005, 2006 and 2007) and season of calving (dry summer, wet summer and winter) taking the parity order of the cow as a covariate. Repeatability (r) of the studied traits was estimated by intra-cow correlation. The results showed that season of calving had no significant effect on all of the studied traits, whereas, the year of calving had no significant effect on only the lactation curve parameters. Persistency correlated negatively with the lactation period, peak yield and constants b and c and positively with week of peak. The study concluded that these crossbred (Kenana × Friesian) cows have moderately repeatable milk persistency. The effects of factors such as calving year and calving season must be taken into consideration when evaluating the production of such cows. The positive phenotypic correlation of lactation yield with peak yield and persistency suggests that one of those traits could be used as a selection criterion to improve all three traits." @default.
- W2340577420 created "2016-06-24" @default.
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- W2340577420 date "2010-01-01" @default.
- W2340577420 modified "2023-09-24" @default.
- W2340577420 title "Seasonal variation of milk persistency of Kenana × Friesian crossbred dairy cows under confinement feeding in a hot environment" @default.
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