کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10161794 | 1110347 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Vasoconstrictive responses of the testicular and caudal arteries in bulls exposed to ergot alkaloids from tall fescue1
ترجمه فارسی عنوان
پاسخ های واستقطبی از عروق بیضه و کادو در گاوها در معرض آلکالوئید های انگور از فسوکای بلند
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کلمات کلیدی
باروری گاو نر، آلکالوئیدهای قلیایی، سوزوکی فسوکو، فستیوال بلند واژن تناسلی،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
Color Doppler ultrasonography was used to evaluate vasoconstrictive responses of the testicular artery in yearling bulls to ergot alkaloids (Neotyphodium coenophialum) produced by a fungal endophyte that infects tall fescue [Lolium arundinaceum (Schreb.) Darbysh.]. Alkaloid-induced constriction of the testicular artery could disrupt thermoregulation. Luminal areas of the testicular artery were monitored and analyzed for 2 experiments that were designed to evaluate fertility responses of bulls to toxic endophyte-infected tall fescue. Experiment 1 (pen experiment) compared diets containing toxic endophyte-infected or endophyte-free tall fescue seed, and Exp. 2 (grazing experiment) compared grazing diets consisting of toxic endophyte-infected and nontoxic endophyte-infected tall-fescue pasture. In Exp. 1 ultrasound images were acquired on 3 dates during the 126-d of feeding and in Exp. 2 on 4 dates during the 155-d of grazing. Luminal area of the caudal artery also was monitored as an indicator of alkaloid-induced vasoconstriction. Caudal and testicular arteries for the toxic treatment responded similarly between experiments. Across imaging dates for Exp. 1, caudal artery lumens for the toxic diet averaged 42% less (P < 0.01) area than the nontoxic diet, and testicular arteries for the toxic diet averaged 40% less (P < 0.05) area than the nontoxic diet. For Exp. 2, there were interactions (P < 0.05) between treatment and imaging date on luminal areas of both arteries. Differences between treatments were not detected until the last 2 image dates, with luminal areas of caudal and testicular arteries on the last date for the toxic tall fescue being 46 and 41%, respectively, less than the nontoxic counterpart. Results indicated that ergot alkaloids can induce constriction of blood flow to the testes that may adversely affect bull fertility.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Professional Animal Scientist - Volume 31, Issue 2, April 2015, Pages 130-136
Journal: The Professional Animal Scientist - Volume 31, Issue 2, April 2015, Pages 130-136
نویسندگان
G.E. PAS, M.G. Burns, H.M. Stowe, J.G. Andrae, S.L. Pratt,