Effects of dietary total non-structural carbohydrates and folic acid and vitamin B₁₂ supplement on growth and meat quality of yearling steers in a forage-based beef production system

Abstract

. 2015. Effects of dietary total non-structural carbohydrates and folic acid and vitamin B 12 supplement on growth and meat quality of yearling steers in a forage-based beef production system. Can. J. Anim. Sci. 95: 281Á291. Thirty-two spring calving cows [760991 kg body weight (BW)] and calves (4494.5 kg BW) were assigned to eight blocks of four cows and their calves each according to parity and calving date. Within each block, two cows were fed a low total non-structural carbohydrate (TNC) diet, while the two others were fed a high TNC diet. Within each diet, cows were administered either no vitamins or weekly intramuscular injections of 160 mg of folic acid plus 10 mg of vitamin B 12 . Calves were slaughtered at 30599 d. Neither TNC concentration nor vitamin supplementation affected (P 0.10) milk yield but the vitamin supplementation increased (P 00.002) milk concentrations of vitamin B 12 . There was no treatment effect on calf performance, or carcass and meat characteristics (P0.10) except for collagen concentrations and shear force measurements in the longissimus lumborum muscle, which had a tendency to be decreased (P50.06) by the vitamin supplement. In the present study, differences in forage TNC concentrations did not influence cow and calf performance. Moreover, folic acid and vitamin B 12 supplements were shown to have little impact in this study on growth of beef cattle. Dans chaque bloc, 2 vaches ont rec¸u une die`te faible en glucides non structuraux totaux (TNC Á « total non-structural carbohydrates ») alors que les 2 autres ont rec¸u une die`te a`haute teneur en TNC. Pour chaque die`te, les vaches ont rec¸u soit des injections intramusculaires hebdomadaires de 160 mg d'acide folique et 10 mg de vitamine B 12 , ou pas. Les veaux ont e´te´abattus a`l'aˆge de 30599 jours. Ni la concentration de TNC ni le supple´ment vitaminique n'ont eu d'effet (P0,10) sur la production laitie`re, mais le supple´ment vitaminique a augmente( P00,002) la concentration de vitamine B 12 dans le lait. Il n'y a pas eu d'effet du traitement sur la croissance des bouvillons ni sur les caracte´ristiques de la carcasse et de la viande (P0,10), sauf une tendance vers une re´duction des concentrations de collage`ne et des mesures de la force de cisaillement du muscle longissimus lumborum (P 50,06) par le supple´ment vitaminique. Dans la pre´sente e´tude, les diffe´rences de concentrations de TNC dans les fourrages n'ont pas modifie´la performance des vaches et des veaux. De plus, le supple´ment d'acide folique et de vitamine B 12 n'a pas eu d'effet sur la croissance des bouvillons dans cette e´tude.

Effect of Supplemental Cyanocobalamin on the Growth Performance and Hematological Indicators of the White Pekin Ducks from Hatch to Day 21

“…Folic acid, vitamin B12, and dietary total non-structural carbohydrates have no effect on milk production and milk total solid yield. There was also a non-significant difference observed on average daily gains among the calves supplemented with these vitamins [17]. Vitamin B12 deficiency also caused health problems in many ways, from hematological manifestations to neurological disorders, varied as leucoenia, numbness in fingers, unsteadiness of gait, fasciculation, and macrocytic anemia [18].…”