The objective of this experiment was to determine the effects altering dietary cation-anion difference (DCAD) fed for last 21 or 42 d gestation on glucose metabolism and tissue insulin responsiveness. Ninety parous Holstein cows at 232 were assigned randomly treatments with 2 levels DCAD (?70 ?180 mEq/kg) durations (short: gestation; long: gestation). For short treatments, a diet +110 mEq/kg fr...

The objectives were to determine the effect of dietary fish oil (FO) on uterine secretion of PGF2alpha, milk production, milk composition, and metabolic status during the periparturient period. Holstein cows were assigned randomly to diets containing FO (n = 13) or olive oil (OO, n = 13). Cows were fed prepartum and postpartum diets that provided approximately 200 g/d from 21 d before the expec...

The effect of cracked corn grain supplementation (3.5 kg/day) during 3 weeks before the expected calving date on milk production and composition, body condition score (BCS), metabolic and hormonal profiles and length of postpartum anoestrus was evaluated in multiparous Holstein dairy cows under grazing conditions (Energy supplemented group, n = 10; Control group, n = 10). Body condition score w...

Twenty-four Holstein cows were used to study the effect of dietary fat on milk production and metabolic traits. Whole cottonseed and tallow were used as fat sources and substituted into the control diet on an isocaloric basis. Chopped alfalfa hay and grain sorghum silage constituted the forage in all diets. Treatments were balanced for parity, body weight, and previous lactation milk production...

Dairy cattle will mobilize large amounts of body fat during early lactation as an effect of decreased lipogenesis and increased lipolysis. Regulation of lipid metabolism involves fatty acid synthesis from acetate and β-adrenergic-stimulated phosphorylation of hormone-sensitive lipase (HSL) and perilipin in adipocytes. Although basic mechanisms of mobilizing fat storage in transition cows are un...

in this study, 32 multiparous non lactating holstein cows were used to investigate the effects of chromium-l-methionine (cr-met) supplementation and dietary energy source on production and nutrient digestibility during the periparturient period. cows were fed a total mixed ration from 28 days before anticipated calving through 28 days after calving. the study was designed as a randomized comple...

Abstract This study aimed to evaluate hemogasometric and metabolic indicators in the first postpartum hours of dairy cows that received different cation-anion diets prepartum period. Holstein (n=14), multiparous, were divided into two groups: (1) acidogenic diet (DA -27.13 mEq/100 g DM) (n=7) (2) neutral (DN -3.25 (n=7), provided from 30 days before expected calving. Urine samples collected eve...

The effect of different feeding intensity at two stages of gestation on performance of primiparous cows was studied in 40 pregnant Ayrshire cows. The feeding intensity was either medium (M) or high (H) in period 1 (2–6 months of pregnancy) or period 2 (7–9 months of pregnancy) resulting in treatments MM, MH, HM and HH. Before pregnancy all heifers were reared to gain 650 g/day. In period 1, hei...