Juniper Publishers Journal of Dairy and Veterinary Sciences

JUNIPER PUBLISHERS - OPEN ACCESS JOURNAL OF DAIRY & VETERINARY SCIENCES Abstract Dairy and tobacco productions, often complementary in the same farm, represent one of the most important economies of Salta province, Argentina. The aim of this work was to evaluate plasma levels of calcium (Ca), phosphorum (P), magnesium (Mg), copper (Cu) and zinc (Zn) between dairy cows from two tobacco-dairy farms (TDF) and from two non-tobacco dairy farms (nTDF). Blood samples were obtained of 10 cows of different physiological productive periods (pre partum, fresh cow, second third of lactation and late lactation). Values Ca, Mg, Cu and Zn serum were performed by atomic absorption spectrophotometry and P values by UV-visible spectrophotometry. The relationships between variables of serum values were analyzed using linear correlation and simple linear regression; in addition, the probability of occurrence of hypocalcemia was analyzed by odds ratio (OR). Total Ca and P levels we...

JUNIPER PUBLISHERS - OPEN ACCESS JOURNAL OF DAIRY & VETERINARY SCIENCES Abstract The objective of this paper is to review the effects of quality and amounts of dietary protein on dairy cattle reproduction and the environment. Protein supplementation is one of important nutrient in dairy production. But, an excess amount of protein beyond the requirements of dairy cow affects reproduction as well as the environment. Protein is needed to meet nitrogen requirements of rumen microorganisms as well as used as a direct source of protein for milking cows. An excess amount of rumen degradable protein can be excreted into the environments and impose an impact on it. Excess rumen degradable protein also results in high amounts of ammonia in the blood of dairy cow when there is no sufficient amount of energy to convert ammonia into microbial protein. In addition, conversion of excess ammonia is energy demanding which can result in negative energy balance. This excess ammonia a...