Performance, Metabolic Responses of Fresh Cows to Daily or Every Other Day Oral Drenching a Glucogenic Precursor
نویسندگان
چکیده مقاله:
The delivery method of [continuous (CONT) vs. every other day or intermittent (INT)] a glucogenic precursor (GP) which was contained glycerin (500 g/kg), mono-propylene glycol (250 g/kg), calcium propionate (150 g/kg), niacin (1 g/kg) and sulfate-Co (350 mg/kg) on performance, selected blood metabolites and liver enzymes were evaluated. Twenty-four multiparous Holstein fresh cows were allocated in a completely randomized design (8 animals/each treatment) fed individually for a period of 14 days after calving. The experimental groups were: 1) no GP supplementation (CTR), 2) GP offered as an oral drench once a day (GP-CONT) on days 3, 4, 5, 6, and 7 after calving and 3) GP offered as an oral drench once a day intermittently (GP-INT) on days 3, 5, 7, 9, and 11 after calving. The amount of oral drenched GP was 1 kg/d. Blood samples were obtained on 5 and 14 days in milk. Dry matter intake (DMI) was increased (P=0.05) in GP-INT cows compared to GP-CONT but not control cows. The yield of fat corrected milk was greater in CTR cows than in GP supplemented cows (P=0.01). The milk protein and fat content were greater for GP-CONT and CTR groups, respectively. Milk somatic cell count was decreased in GP supplemented cows than in CTR cows (64.5 vs. 365×103/mL; P=0.02).Plasma total protein concentration was greater in GP-CONT group. Insulin concentration was increased for GP-CON animals on day 5 (P<0.05). Non-esterified fatty acids and β-hydroxy butyrate as well as liver enzymes were unaltered by treatments. However insulin sensitivity index was lower in supplemented treatments with GP rather than control group (P<0.05). In conclusion, the intermittent delivery of glucogenic precursor may be recommendable in fresh cows based on DMI criteria, which warrants further studies.
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عنوان ژورنال
دوره 9 شماره 1
صفحات 31- 38
تاریخ انتشار 2019-03-01
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