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- W2339054620 abstract "–ct = exp(k + blogt – ct), where a, b, and c are constants that specify the shape of the lactation curve. Once estimates of the 3 parameters describing the ewes’ lactation were obtained, these were used in calculations to derive maximum milk yield (ymax), time of maximum milk yield (tmax), cumulative milk yield up to 84 DIM (YCUM84) and ratio of yield on DIM 84 to peak yield (r84), with higher values of r84 indicating a more persistent lactation. Correlation coefficients were calculated for lactation traits and VFI and LW data. The Wood (1967) nonlinear mixed effects model fitted to the lactation data was successful in describing the shapes of the lactation curves of these sheep. Previous studies in the area have noted that the Wood (1967) model is effective at determining differences between lactation curve shapes within the population (Cappio-Borlino et al. 1995; Franci et al. 1999). YCUM84 was positively correlated with ymax (r=0.64; P<0.001) and r84 (r=0.43; P<0.001), indicating that both peak yield and lactation persistency are important in determining the total lactation yield. Lactation traits were not related to VFI or LW changes before lambing. YCUM and ymax were positively correlated to VFI after lambing, while no correlation was observed with LW after birth. Finally, VFI was positively correlated with the ewes’ LW post-lactation. It is interesting to note that ymax was negatively correlated with r84 (r=-0.28; P<0.05). This observation indicates that animals with low persistency values generally have a high peak milk production, which declines rapidly and high persistency values define lactations with a flatter curve. These types of lactations would be desirable to milk producers in all species as it would aid in feed and reproductive management during early lactation. However, there is renewed interest in the persistency of lactation because the maximization of yield does not necessarily represent the best economical choice. Finally, the low to moderate heritability of lactation persistency suggests the possibility of selecting for the optimal shape of the lactation curve (Chang et al. 2001). Further analyses are required to determine possible relationships between plasma biomarkers and lactation traits. Monitoring energy balance of ewes will be important because of the high genetic variability within breed leading to marked differences in milk yield." @default.
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- W2339054620 date "2006-01-01" @default.
- W2339054620 modified "2023-09-22" @default.
- W2339054620 title "LACTATION CURVE CHARACTERISTICS AND PERSISTENCY OF LACTATION IN DAIRY EWES MILKED ONCE A DAY: PRELIMINARY OBSERVATIONS" @default.
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