کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2454464 | 1110392 | 2009 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of Prepartum Whole Fuzzy Cottonseed or Whole Raw Soybean Supplementation on Response to Timed Artificial Insemination by Suckled Mature Beef Cows Following Ovulation Synchronization1
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Cows (n = 188; average initial BW = 579±54 kg) were stratified by BCS and BW and assigned to 3 supplementation treatments: whole raw soybeans (21.6% fat), whole fuzzy cottonseed (21.7% fat), or a 50:50 mixture of ground corn and soybean meal (2.6% fat; i.e., the control supplement). Supplements were fed daily at 1.8 kg/cow for 45 d before the first projected calving date. Supplementation was continued until calving. Ovulation was synchronized using the Cosynch + controlled internal drug release (CIDR) protocol (injection of GnRH 7 d before and 64 h after a 7-d intravaginal CIDR insert containing 1.38 g of progesterone) and a 25-mg injection of PGF2α. Cows were inseminated artificially at 60 to 64 h after CIDR removal. Eleven days after AI, cows were exposed to fertile bulls for natural-service breeding for 50 d. Conception to AI was assessed 33 d after AI; overall pregnancy rate was assessed 126 d after AI. Body weight of cows fed control or oilseed supplements was similar (P > 0.3) at calving, at initiation of ovulation synchronization, and at the end of the breeding season. Cottonseed-supplemented cows lost more BW and more BCS (P < 0.03) from the onset of supplementation until calving than those fed soybeans. Proportion of cows with estrus cycles was similar (P = 0.57) among treatments. Pregnancies per fixed-time AI and final pregnancy rate were similar (P â¥0.75) between control and oilseed-supplemented cows. Conversely, supplementation with cottonseed tended (P = 0.08) to increase pregnancies per timed AI (54 and 39% for cottonseed and soybeans, respectively) and increased (P = 0.03) final pregnancy rate compared with soybean-fed cows (100 and 93% for cottonseed and soybeans, respectively). In conclusion, cows supplemented with whole, fuzzy cottonseed tended to have a greater timed AI pregnancy rate and had a greater final pregnancy rate than cows supplemented with whole, raw soybeans. Effects of cottonseed and soybean supplementation on response to ovulation synchronization and fixed-time AI by beef cows warrant further study.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Professional Animal Scientist - Volume 25, Issue 1, February 2009, Pages 41-48
Journal: The Professional Animal Scientist - Volume 25, Issue 1, February 2009, Pages 41-48
نویسندگان
M.D. Thomas, K.C. PAS, J.S. Stevenson, J.R. PAS, J.W. Bolte, N.A. Sproul, D.A. Linden, L.A. Pacheco,