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دسته بندی:
هوش مصنوعی - Artificial intelligence
سال انتشار:
2020
عنوان انگلیسی مقاله:
Postpartum health disorders in lactating dairy cows and its associations with reproductive responses and pregnancy status after first timed-AI
ترجمه فارسی عنوان مقاله:
اختلالات بهداشتی پس از زایمان در گاوهای شیری شیرده و ارتباط آن با پاسخ های تولید مثل و وضعیت بارداری پس از اولین زمانبندی هوش مصنوعی
منبع:
Sciencedirect - Elsevier - Theriogenology, 141 (2020) 98-104. doi:10.1016/j.theriogenology.2019.09.017
نویسنده:
F. Mohtashamipour a, E. Dirandeh a, *, Z. Ansari-pirsaraei a, M.G. Colazo b
چکیده انگلیسی:
The objective was to evaluate the association between postpartum health disorders, reproductive responses
and pregnancy status in lactating multiparous cyclic Holstein cows. Cows were retrospectively
categorized as healthy (n ¼ 70) or sick (n ¼ 60) based on postpartum health records and serum metabolites.
Sick cows were further categorized as having metabolic (MET; n ¼ 35), infectious (INF; n ¼ 15), or
both diseases (MET/INF; n ¼ 10). Blood samples were collected on d 7 and 14 after calving to determine
serum concentrations non-esterified fatty acids (NEFA), b-hydroxybutyrate (BHB) and aspartate
aminotransferase (AST), on d 0 (TAI), 8, 16, 18 and 20 after TAI to determine concentrations of progesterone
(P4; d 0, 8, 16, 18 and 20) and prostaglandin F metabolite (PGFM; d 16, 18 and 20) and interferonstimulated
gene-15 (ISG15; d 16) relative mRNA expression. Cyclicity was determined by transrectal
ultrasonography 30 d postpartum and cows were subjected to a GnRH-based TAI protocol (to classify
cows bearing a visible CL as cyclic). Prediction of pregnancy status on d 16 after TAI was determined by
ISG15 mRNA gene expression relative to b actin and following, pregnancy was diagnosed by transrectal
ultrasonography at 32 and 60 d after TAI. An interaction (P ¼ 0.04) between occurrence of disease and
pregnancy status was detected for the expression of ISG15 in blood, with healthy pregnant healthy cows
having the greatest relative expression of ISG15. Postpartum health disorders were associated with
reduced concentration (P < 0.05) of serum P4 post TAI. However, serum P4 concentrations at TAI were
greater (P ¼ 0.01) in sick cows (0.65 ± 0.09, 0.86 ± 0.13 and 0.75 ± 0.10 ng/mL for MET, INF and MET/INF
cows, respectively) compared with that in healthy cows (0.24 ± 0.10 ng/mL). Serum concentrations of
PGFM after TAI was reduced in healthy cows, regardless of pregnancy status. Pregnancy status on d 16
after TAI predicted by ISG15 mRNA expression and P/AI on d 32 and 60 after TAI based on ultrasonography,
were negatively affected (P < 0.05) by occurrence of health disorders. Similarly, pregnancy loss
from d 16 to 32 and d 16 to 60 after TAI was greater (P < 0.05) in sick cows compared to that in healthy
cows. However, neither P/AI nor pregnancy loss were associated to the category of postpartum health
disorder. Cows affected by postpartum health disorders had overall reduced P4 and greater PGFM serum
concentrations after TAI, which were associated with reduced pregnancy success and enhanced pregnancy
loss. Collectively, our findings support the hypothesis of a carryover effect of disease on reproductive
responses, embryo survival and maintenance of pregnancy in lactating dairy cows independent
of the category of postpartum health disorder.
Keywords: Fertility | Maintenance of pregnancy | Embryonic mortality | ISG15
قیمت: رایگان
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