A successful reproduction is important for a sustainable dairy production. The pre-partum maternal behaviour of dairy cows is important in the design of calving facilities and when aiming to ensure a successful calving. The causation of the behaviour is, however, currently not fully understood, and therefore this PhD thesis aimed to obtain new knowledge about the behaviour of parturient cows and the use of maternity pens. Five specific research questions were formed based on areas of interest within this scope; a Do dairy cows prefer a certain type or degree of isolation when calving, and does the choice of isolation influence pre-partum maternal behaviour? Five consecutive experiments were conducted and the results revealed new aspects of maternal behaviour of parturient cows. Parturient dairy cows showed no preference for a specific level of physical cover in the individual maternity pen.
Phosphorus homeostasis in dairy cows
American Dairy Science Association > Membership > Graduate Student Division > 3-Min Thesis
The data was collected for the twelve years period to find out the effect of parity and breed on incidence of mastitis. The parity number significantly influenced mastitis incidence in indigenous Pty number. Incidence of mastitis was also influenced by breed and was maximum in crossbred cows in comparison to indigenous cows and Murrah buffaloes. It was concluded that increase in parity result in increased incidence of mastitis in cows and buffaloes and the differential incidence was due to breed effect in the same parity. Indian Journal Of Animal Research. Kantwa and Navav Singh sureshjingar yahoo.
No document with DOI "10.1.1.943.6680"
Walter A Gruenberg , Purdue University. Phosphorus P nutrition and homeostasis in dairy cattle has received increasing attention because excessive P excretion in animal waste has led to environmental concerns and a resultant decrease in the P content of dairy cow rations. Although current recommendations for dietary P supplementation are considered safe, the continuously increasing milk production of dairy cows presents an increasing challenge for the P homeostasis, particularly at the onset of lactation. In the present thesis four studies exploring potential mechanisms affecting P homeostasis in early lactating dairy cows are presented. A retrospective study conducted on over cows with displaced abomasum or abomasal volvulus revealed that decreased feed intake as seen in sick cows is likely to result in hypophosphatemia, whereas dehydration and decreased renal perfusion can cause hyperphosphatemia.