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- W4238448135 abstract "Abstract The objective of this study was to investigate the effect of both cow genetic index (CGI) and feeding system on the performance of second lactation Holstein-Friesian dairy cows on grass-based feeding systems. There was no interaction between CGI and feeding system for any of the parameters measured. Cows of high genetic index (HGI) produced significantly higher yields of milk ( P < 0.001), fat ( P < 0.001) protein ( P < 0.0001) and lactose ( P < 0.001) than medium genetic index cows (MGI). CGI had no effect on the concentration of milk constituents. Averaged across four intake measurements the HGI cows had significantly ( P < 0.001) higher grass dry-matter intake (GDMI) and total dry-matter intake (TDMI). Live weight was similar for both genotypes during lactation. The HGI cows had significantly ( P < 0.05) higher live-weight loss in the first 10 weeks of lactation, significantly lower live-weight gain from week 10 to the end of lactation and higher ( P < 0.05) live-weight gain during the dry period. Condition score was significantly lower with the HGI ( P < 0.001) at all stages of lactation. There was a higher proportion ( P < 0.05) of the HGI cows non-pregnant at the end of the 13-week breeding season. Feeding system had a significant effect on the yield of milk ( P < 0.001), fat ( P < 0.001), protein ( P < 0.001) and lactose ( P < 0.001). Feeding system B produced significantly higher ( P < 0.05) milk yield and yield of constituents (when compared with feeding systems A and C). Over the period when feeding systems were being applied, feeding system C had significantly higher ( P < 0.05) milk protein concentration. Feeding system had a significant effect ( P < 0.001) on both GDMI and TDMI. Feeding system had no effect on live weight, condition score or fertility performance." @default.
- W4238448135 created "2022-05-12" @default.
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- W4238448135 date "1999-01-01" @default.
- W4238448135 modified "2023-09-27" @default.
- W4238448135 title "The effect of cow genetic index and grass-based feeding system on the performance of spring-calving Holstein-Friesian cows in second lactation" @default.
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- W4238448135 doi "https://doi.org/10.1017/s1463981500043156" @default.
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