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- W2600491160 abstract "Multiparous Holstein cows were assigned in a randomized complete block design into four treatments from 21 d before calving to 30 d in milk (DIM). Treatments were: MET [n = 19, fed the basal diet + rumen-protected methionine at a rate of 0.08% (w/w) of the dry matter, Smartamine® M], CHO (n = 17, fed the basal diet + choline 60 g/d, Reashure®), MIX (n = 21, fed the basal diet + Smartamine® M at a rate of 0.08% (w/w) of the dry matter and 60 g/d Reashure®), and CON (n = 20, no supplementation, fed the close-up and fresh cow diets). Follicular development was monitored via ultrasound every 2 d starting at 7 DIM until ovulation (n = 37) or aspiration (n = 40) of the first postpartum dominant follicle (DF). Follicular fluid from 40 cows was aspirated and cells were retrieved immediately by centrifugation. Gene expression of TLR4, TNF, IL1-β, IL8, IL6, LHCGR, STAR, 3β-HSD, P450scc, CYP19A1, IRS1, IGF, MAT1A, and SAHH, was measured in the follicular cells of the first DF. Cows in CON had higher TNF, TLR4, and IL1-β mRNA expression (11.70 ± 4.6, 21.29 ± 10.4, 6.28 ± 1.4, respectively) than CHO (2.77 ± 0.9, 2.16 ± 0.9, 2.29 ± 0.7, respectively), and MIX (2.23 ± 0.7, 1.46 ± 0.6, 2.92 ± 0.8, respectively). Cows in CON had higher IL1-β expression (6.27 ± 1.4) than cows in MET (3.28 ± 0.6). Expression of IL8 mRNA was lower for cows in CHO (0.98 ± 0.3) than cows in CON (4.90 ± 0.7), MET (6.10 ± 1.7), or MIX (5.05 ± 1.8). Treatments did not affect mRNA expression of LHCGR, STAR, P450scc, CYP19A, SAHH, MAT1A, or IL6 however, 3β-HSD expression was higher for cows in MET (1.46 ± 0.3) and MIX (1.25 ± 0.3) than CON (0.17 ± 0.04) and CHO (0.26 ± 0.1). Supplementation of methionine, choline, and both methionine and choline during the transition period did not affect days to first ovulation or number of cows that ovulated the first follicular wave. Plasma and follicular fluid estradiol and progesterone concentrations were not different among treatments. Methionine concentrations in the follicular fluid of the first postpartum DF was higher for cows in MET (18.2 ± 0.1 μM) than cows in CON (11.1 ± 0.9 μM). In conclusion, supplementing choline and methionine during the transition period changed mRNA expression in follicular cells and dietary methionine supplementation increased plasma and follicular fluid concentrations of methionine of the first postpartum DF in Holstein cows." @default.
- W2600491160 created "2017-04-07" @default.
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- W2600491160 date "2017-07-01" @default.
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- W2600491160 title "Effects of rumen-protected methionine and choline supplementation on steroidogenic potential of the first postpartum dominant follicle and expression of immune mediators in Holstein cows" @default.
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- W2600491160 doi "https://doi.org/10.1016/j.theriogenology.2017.03.022" @default.
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