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Articles by D. Kianzad
Total Records ( 2 ) for D. Kianzad
  G. R. Ghorbani , D. Kianzad , M. Alikhani and A. Nikkhah
  High Ambient Temperatures (AT) would be an additional pressure on early-lactation cows already undergoing physiological and metabolic adaptations of early-lactation. Methionine is the initiator amino acid in any polypeptide biosynthesis. The high AT can stimulate the synthesis of specific proteins by the immune system to maintain cell integrity. The high AT was hypothesized to increase maintenance methionine requirements in dairy cattle already facing large methionine demands of early-lactation. The primary objective was to determine the effects of a Rumen-Protected Met (RPM) product (SmartamineMTM) on productivity and estrous expression visibility in early-lactation dairy cattle under high AT. Ten second-calf and fifteen third- and fourth-calf Holstein cows were grouped based on parity, previous milk production records and body condition score. Cows within each group were randomly assigned to either a control (n = 13) or a RPM treatment (n = 12) at 2 week prepartum and monitored through 14 week in milk. The cows were housed in loose stalls receiving 12 g daily RPM from 2 week prepartum to 2 week postpartum and 17 g RPM from 3 week through 14 week postpartum. The control cows received the same diets but without RPM. Body condition was scored at -14, 25, 60 and 110 day of calving. The visibility of estrous expression was scored on the basis of standing and mounting activities with the scorers blind to the treatments. The average maximum daily AT was 42°C in August. Across the experimental weeks, RPM increased (p<0.01) milk contents of protein, lactose and SNF in all cows. The RPM increased (p = 0.04) milk protein yield and tended (p = 0.09) to increase milk yields of energy and fat in second-calf cows but not in older cows. In addition, feeding RPM improved (p = 0.05) visibility of estrous expression across parities. Analysing the polynomial coefficients of individual lactation curves suggested that RPM-fed cows had a more persistent milk yield than control cows (p = 0.05). Results demonstrated that RPM can benefit early-lactation dairy cattle under high ambient temperatures.
  A. Nikkhah , D. Kianzad , A. Hajhosseini and A. Zalbeyk
  The objective was to establish prolonged effects of a rumen-protected Met (RPM) product (SmartamineMTM) on milk production and reproduction of high-producing early-lactation cows under extended very high ambient temperatures. Twenty four fresh Holstein cows (27±9 days in milk, 617 kg b.wt., 2.8 body condition score) including 12 second lactation and 12 higher lactation cows were randomly assigned to either control or RPM-supplemented total mixed rations (TMR, 520:480 g kg-1 forage:concentrate), and were fed continuously for 5 months. Cows were offered TMR 3 times daily post-milking plus a top-dress alfalfa hay. The study was conducted from May through November of 2009 in central Iranian province of Isfahan. The RPM group had consistently greater 5-month-long average DM intake (21.9 vs. 19.1 kg day-1), milk yield (42.4 vs. 37.4 kg day-1), milk fat content (33 vs. 27.5 g kg-1), fat yield (1.40 vs. 1.04 kg day-1), milk protein content (29.6 vs. 27.5 g kg-1) and protein yield (1.25 vs. 1.02 kg day-1). Mature cows tended to produce mor e milk (42.2 vs. 37.6 kg day-1) and milk fat (1.30 vs. 1.13 kg day-1) than second lactation cows. The RPM significantly improved ovary function, estrus expression visibility and body condition score (3 vs. 2.6), while shortening days open (106 vs. 143) and calving interval (387 vs. 421 d). Findings provide compelling evidence for beneficial effects of prolonged RPM provision on feed intake, milk production, and reproduction of Holstein cows under concurrent metabolic pressures of early lactation and stressful high ambient temperatures.
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