Effects of supplementation with ruminally protected choline on performance of multiparous Holstein cows did not depend upon prepartum caloric intake
| Autor: | A.L.G. Dias, C.R. Staples, Bruce A. Barton, J.E. Zuniga, Corwin D. Nelson, John P. Driver, R. Gardinal, M.G. Zenobi, José E. P. Santos |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Male medicine.medical_treatment Energy balance Ice calving Biology Choline 03 medical and health sciences chemistry.chemical_compound Animal science Pregnancy Lactation Genetics medicine Animals Dry matter Triglycerides 3-Hydroxybutyric Acid Artificial insemination Insulin Postpartum Period 0402 animal and dairy science Parturition 04 agricultural and veterinary sciences medicine.disease 040201 dairy & animal science Diet Parity 030104 developmental biology medicine.anatomical_structure Milk chemistry Liver Dietary Supplements Animal Science and Zoology Cattle Female Energy Intake Energy Metabolism Food Science |
| Zdroj: | Journal of dairy science. 101(2) |
| ISSN: | 1525-3198 |
| Popis: | Objectives were to evaluate the effect of prepartum energy intake on performance of dairy cows supplemented with or without ruminally protected choline (RPC; 0 or 17.3 g/d of choline chloride; 0 or 60 g/d of ReaShure, Balchem Corp., New Hampton, NY). At 47 ± 6 d before the expected calving date, 93 multiparous Holstein cows were assigned randomly to 1 of 4 dietary treatments in a 2 × 2 factorial arrangement. Cows were fed energy to excess [EXE; 1.63 Mcal of net energy for lactation/kg of dry matter (DM)] or to maintenance (MNE; 1.40 Mcal of net energy for lactation/kg of DM) in ad libitum amounts throughout the nonlactating period. The RPC was top-dressed for 17 ± 4.6 d prepartum through 21 d postpartum (PP). After calving, cows were fed the same methionine-balanced diet, apart from RPC supplementation, through 15 wk PP. Liver was biopsied at -14, 7, 14, and 21 d relative to parturition. Cows fed EXE or MNE diets, respectively, consumed 40 or 10% more Mcal/d than required at 15 d before parturition. Cows fed the MNE compared with the EXE diet prepartum consumed 1.2 kg/d more DM postpartum but did not produce more milk (41.6 vs. 43.1 kg/d). Thus, PP cows fed the EXE diet prepartum were in greater mean negative energy balance, tended to have greater mean concentrations of circulating insulin, fatty acids, and β-hydroxybutyrate, and had greater triacylglycerol in liver tissue (8.3 vs. 10.7% of DM) compared with cows fed the MNE diet prepartum. Cows fed RPC in transition tended to produce more milk (43.5 vs. 41.3 kg/d) and energy-corrected milk (44.2 vs. 42.0 kg/d) without increasing DM intake (23.8 vs. 23.2 kg/d) during the first 15 wk PP, and tended to produce more milk over the first 40 wk PP (37.1 vs. 35.0 kg/d). Energy balance of cows fed RPC was more negative at wk 2, 3, and 6 PP, but mean circulating concentrations of fatty acids and β-hydroxybutyrate did not differ from those of cows not fed RPC. Despite differences in energy balance at 2 and 3 wk PP, mean concentration of hepatic triacylglycerol did not differ between RPC treatments. Feeding RPC reduced the daily prevalence of subclinical hypocalcemia from 25.5 to 10.5%, as defined by concentrations of total Ca of |
| Databáze: | OpenAIRE |
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