机构地区:[1]E + E Technical Advisory Services, Bowmanville, Ontario, Canada [2]Jefo Nutrition, Inc., St. Hyacinthe, Quebec, Canada [3]AlZahal innovation and Nutrition, Kitchener, Ontario, Canada
出 处:《Open Journal of Animal Sciences》2021年第4期580-590,共11页动物科学期刊(英文)
摘 要:<span style="font-family:Verdana;">The objective of this research was to evaluate the impact of a dietary supplemental rumen protected B vitamin blend (RPBV: Folic acid, B12, pyridoxine, pantothenic acid, and biotin;Jefo, St. Hyacinthe, QC Canada) on milk, fat</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and protein yield in cows past peak lactation. Results from 50 double reversal design trials (control-test-control) were evaluated using meta-analyses. All herds participated in monthly milk recording services, and all were Holstein herds. Within each of the 50 trials, cows included in the statistical analysis were over 45 days in milk (DIM) at </span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">first milk test, averaged </span><span style="font-family:Verdana;">159 ± 26 DIM on the first test date</span></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and were available for all milk collection periods. A total of 6483 cows from 7 countries were represented in the 50 studies, with an average herd size of 129.7 ± 118.0. Meta-analyses were conducted to determine effect size for milk, fat</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and protein yield based on the treatment differences and standard errors (SE) from the individual trials. Results indicated that dairy cows responded positively to the inclusion of the rumen protected B vitamin blend. Forest plots revealed trial</span><span style="font-family:Verdana;">-</span><span style="font-family:Verdana;">to</span><span style="font-family:Verdana;">-</span><span style="font-family:Verdana;">trial variation and might be related to age, level of milk production</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and stage of lactation of the cows.</span><span style="font-family:Verdana;">The objective of this research was to evaluate the impact of a dietary supplemental rumen protected B vitamin blend (RPBV: Folic acid, B12, pyridoxine, pantothenic acid, and biotin;Jefo, St. Hyacinthe, QC Canada) on milk, fat</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and protein yield in cows past peak lactation. Results from 50 double reversal design trials (control-test-control) were evaluated using meta-analyses. All herds participated in monthly milk recording services, and all were Holstein herds. Within each of the 50 trials, cows included in the statistical analysis were over 45 days in milk (DIM) at </span><span style="font-family:Verdana;">the </span><span style="font-family:;" "=""><span style="font-family:Verdana;">first milk test, averaged </span><span style="font-family:Verdana;">159 ± 26 DIM on the first test date</span></span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and were available for all milk collection periods. A total of 6483 cows from 7 countries were represented in the 50 studies, with an average herd size of 129.7 ± 118.0. Meta-analyses were conducted to determine effect size for milk, fat</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and protein yield based on the treatment differences and standard errors (SE) from the individual trials. Results indicated that dairy cows responded positively to the inclusion of the rumen protected B vitamin blend. Forest plots revealed trial</span><span style="font-family:Verdana;">-</span><span style="font-family:Verdana;">to</span><span style="font-family:Verdana;">-</span><span style="font-family:Verdana;">trial variation and might be related to age, level of milk production</span><span style="font-family:Verdana;">,</span><span style="font-family:Verdana;"> and stage of lactation of the cows.</span>
关 键 词:META-ANALYSIS Dairy Nutrition Rumen Protection B Vitamins
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