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Practical relationships were determined between milk production, health, and reproduction with the amount and use of body fat in high producing lactating Holstein dairy cattle. Approximately 350 cows and heifers > 15 mo of age in a high producing herd were assigned body condition scores at monthly intervals for 24 mo. Production of 305-d FCM averaged 9541(More)
To test the effect of chromium propionate on glucose utilization in growing dairy heifers, 0, 5, 10, or 15 mg of chromium/d were fed to 20 Holstein heifers of 11 to 14 mo of age, in a replicated Latin square. A 2-wk adaptation period was followed by 4 periods of 2 wk each with a 2-wk flush out period between treatments. Treatments were allotted to periods(More)
The responsiveness of progency of sheep-derived unilocular fat cells (adipofibroblasts) to dexamethasone, insulin, insulinlike growth factor I (IGF-I), growth hormone (GH), and basic fibroblst growth factor (FGF) was determined in a clonal culture system. Primary cultures of mature adipocytes were obtained from intermuscular adipose tissue(More)
Holstein cows were assigned to diets containing no supplemental fat, supplemental fat from whole cottonseed, or supplemental fat from whole cottonseed plus Ca salts of fatty acids (Megalac). The TMR contained 46% forage and 54% concentrate or mixtures of concentrate and whole cottonseed on a DM basis and were fed from wk 3 through 44 of lactation. The mean(More)
The objective of the study was to establish and compare equations that would estimate the body fat content of lactating dairy cows from different indirect techniques. The techniques used were body condition scoring, dilution of D2O in body water, and determination of mean fat cell size diameter of the subcutaneous, abdominal, and perirenal depots. Each(More)
In order to provide data with which to challenge a model of metabolism of lactating sows, we conducted a study to determine milk production and body and mammary composition in sows consuming a range of energy and amino acid intakes and nursing 11 to 12 pigs. Sows (2nd through 4th parity) consumed the same ration during gestation and consumed 6.1 kg/d(More)
Molly is a deterministic, mechanistic, dynamic model representing the digestion, metabolism, and production of a dairy cow. This study compared the predictions of enteric methane production from the original version of Molly (MollyOrigin) and 2 new versions of Molly. Updated versions included new ruminal fiber digestive parameters and animal hormonal(More)
The adaptations of fat synthesis in adipose tissue to lactational state, rate of milk production, and dietary fat intake were determined for dairy cows. Lipogenesis and esterification were determined in cows of average or high genetic merit for milk production and fed either a control TMR of corn silage, alfalfa, and concentrate (2.5% fat; 1.47 Mcal of(More)
To define better the role of metabolism in adipose tissue during gestation and lactation, adaptations to gestation, lactation and to decreased energy intakes were determined using pigs as a model. The effects of energy restriction and the interactions of restriction during both periods were tested by feeding one of two rations during gestation to provide(More)
The objective of research under the NC-185 regional project is to identify the critical chemical transformations in the rumen, digestive tract, gastrointestinal and splanchnic tissues, and adipose and mammary tissues that define patterns of nutrient utilization in lactating dairy cows. This objective includes research on differences in fermentation,(More)