Effects of a rumen protected B vitamin blend upon milk production and component yield in lactating dairy cows

Abstract

<p> <span style="font-size:10.0pt;font-family:"">Results from 12 switchback field trials involving 1216 cows were combined to assess the effects of a protected B vitamin blend (BVB) upon milk yield (kg), fat percentage (%), protein %, fat yield (kg) and protein yield (kg) in primiparous and <span>multiparous cows. Trials consisted of 3 test periods</span><span> executed in the order control-test-control. </span>No diet <span>changes other than the inclusion of 3 grams/cow/ day </span>of the BVB during the test period occurred. Means from the two control periods were compared to results obtained during the test period <span>using a paired T test. Cows include in the analysis</span> were between 45 and 300 days in milk (DIM) at <span>the start of the experiment and were continuously</span> available for all periods. The provision of the BVB resulted in increased (P < 0.05) milk, fat %, protein %, fat yield and protein <span>yield. Regression models showed that the amount of</span><span> milk produced had no effect upon the magnitude</span> of the increase in milk components. The increase in milk was greatest in early lactation and declined with DIM. Protein and fat % increased with DIM in mature cows, but not in first lactation cows. Differences in fat yields between test and control feeding <span>periods did not change with DIM, but the improve</span><span>ment in protein yield in mature cows declined with</span> <span>DIM. These results indicate that the BVB provided</span> economically important advantages throughout lactation, but expected results would vary with cow age and stage of lactation.</span><span style="font-size:10.0pt;font-family:""></span> </p

Effects of rumen‐protected pantothenate supplementation on lactation performance, ruminal fermentation, nutrient digestion and blood metabolites in dairy cows

“…In the current study, the tendency towards increased DM intake with incresing RPP supplementation was associated with the tendency towards decreased ruminal pH, the tendency towards increased total VFA and digestibility of NDF and ADF. However, other studies reported that DM intake was not affected by a B vitamin blend containing PA in dairy cows . The positive effects of RPP on milk yields, milk fat percentage and yield as well as BCS changes were attributed to the improved digestibilities of DM, OM and CP.…”

“…also found that milk, milk fat and protein yields were unaffected by a B vitamin blend containing PA. The different responses of PA on lactation performance might be associated with lactation stage of dairy cows as well as the administration mode and dose of PA . The early lactation cows might be more sensitive to supplementary PA due to the reduced DM intake relative to milk production .…”

“…1,4,5 It is suggested that dietary supplemental unprotected PA or ruminal synthesised PA can not effectively meet the requirement of high producing dairy cows, and rumen-protected pantothenate (RPP) supplements are necessary. Limited literature has demonstrated that supplementary PA or a B vitamin blend containing PA increased milk yields, milk composition and component yields, [5][6][7][8] body condition score (BCS), 9 rumen fermentation, 10,11 and plasma glucose content. 5 However, other literature reported that additional PA had no influence on milk yields, milk composition and component yields, ruminal microbial protein synthesis and serum glucose content.…”

Effect of B1 and B12 vitamins injection on milk yield, composition and some blood biochemical in Holstein dairy cows

“…In this study milk fat tended to increase by B1 and B12 injection. Evans and Mair (2013) showed that milk fat on average increased when cows were given the B vitamin blend. Nonetheless, the results seem to indicate that supplemental vitamin B12 acts on the two vitamins B12 dependent metabolic pathways.…”

“…In the experiment concerned, all cows received the same basal diet; hence, the nutrient supply should be similar among the treatments and differences in plasma concentrations are likely to reflect changes in tissue utilization. Evans and Mair (2013) suggested that a response can be anticipated at all levels of milk production. In cows fed supplementary folic acid, it seems that tissue utilization of biotin was increased by vitamin B12 supplementation and resulted in increased formation of protein.…”