Ruminant Nutrition - 747 Words

Supplementation of folic acid in ruminant Consequently, the role of FA in ruminant nutrition has largely been ignored. As folate plays crucial role in DNA synthesis and methionine cycle, its requirement increases during gestation and lactation. Recent evidences however, suggest that microbial synthesis may not be adequate to meet the high demand of FA during gestation and lactation (Ragaller et al., 2008). It is now quantitatively known that microbial synthesis of FA ranged from 16.5 to 21 mg/d in a high yielding cow weighing 650 kg and producing 35 kg of milk per day, whereas, the estimated requirement was 35 mg/cow (Scwab et al., 2006; Santschi et al., 2005). There are some studies which indicates that supplementation of FA increased the†¦show more content†¦This might be due to increased rumen activity due to increased supply of degradable carbohydrates. However, other studies (Santschi et al., 2005) did not observe any difference in rumen folate concentration in cows fed either 37 or 70% forages. Lower concentra tion of rumen folate in cows on high forage diet was attributed to the fact that most fibrolytic bacteria take up folate. A recent study shows evidences that fibrolytic bacteria need FA acid for growth and multiplication (Wang et al., 2016). Similarly, Heyes et al. (1966) and Girard et al. (1994) reported decreased rumen concentration of folate in cattle fed high forage diets. It is already demonstrated that Ruminococcus flavifaciens require folic acid, tetra-hydro folate or para-amino benzoic acid for growth and multiplication (Ayers, 1958; Slyter and Weaver, 1977; Scott and Dehority, 1965; Bryant and Robinson, 1961). Two strains of Rminococcus albus also required FA (Bryant and Robinson, 1961). Supplementation of rumen protected folic acid (RPFA) at 0. 0.6, 1.2 and 1.8 g/d to steers provided 0, 18.2, 36.4 and 54.6 mg/d of folic acid to rumen microorganisms, respectively. The influence of supplementation of RPFA on rumen fermentation was mostly quadratic (Wang et al., 2016). Secretion of cellulytic enzymes depend on the growth and multiplication of cellulyticShow MoreRelatedEssay about Placental Ruminants and Herbivorous Marsupials of Australia3561 Words   |  15 PagesPlacental Ruminants and Herbivorous Marsupials of Australia The marsupial animal species that have evolved on the isolated continent of Australia are unique compared to the rest of the animal kingdom in many ways due to the harsh and distinctive environment found on the continent. The major area of marsupial biology that distinguishes them from all other eutherian mammals is their mode of reproduction. 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