02928naa a2200325 a 450000100080000000500110000800800410001902400430006010000240010324502270012726000090035450001360036352017630049965000110226265000240227365300080229765300140230565300180231965300170233765300180235465300340237270000150240670000180242170000180243970000220245770000180247970000190249770000170251677300690253310598542019-11-04       2019    bl uuuu     u00u1 u    #d7 a10.1016/j.anireprosci.2019.05.0112DOI1 aOLIVERA-MUZANTE, J.  aShort-term dietary protein supplementation improves reproductive performance of estrous-synchronized ewes when there are long intervals of prostaglandin or progesterone-based treatments for timed AI.h[electronic resource]  c2019  aArticle history: Received 21 November 2018 //Received in revised form 9 May 2019// Accepted23May2019//Available online 25 May 2019.  aAbstract:To evaluate the reproductive effects of a short-term dietary protein supplementation (Days -10 to -3) before timed AI (TAI = Day 0), 471 Merino ewes grazing native pastures were estrous-synchronized when there were either long intervals between prostaglandin administrations (two prostaglandin injections 15 or 16 d apart; PG15 and PG16, respectively) or with a progesterone-eCG (P4-eCG) protocol, resulting in a 3 × 2 experimental design. Ovulation rate on Day 8 (OR), non-estrous-return to Day 21 (NRR21), and fertility, prolificacy and fecundity on Day 70 were evaluated. The interaction between estrous synchronization protocol and supplementation was not significant for any of these variables (P > 0.05). Supplementation increased OR, prolificacy and fecundity (+0.14, +0.15 and +0.14, respectively, P < 0.01), but did not affect NRR21 or fertility of ewes (+6.2% and +6.7% respectively, P > 0.05). Ewes treated using the PG15 and PG16 protocols had a lesser OR (-0.27), prolificacy (?0.22) and fecundity (?0.20) than ewes treated using P4-eCG protocol (P < 0.01 for each), and similar NRR21 and fertility (?5.4% and ?7.9% respectively, P > 0.05 for both variables), without significant differences between the PG15 and PG16 groups. In conclusion, a short-term dietary protein supplementationbefore TAI improved OR, prolificacy and fecundity of ewes which were estrous-synchronized by imposing long interval PG (15 or 16 d apart) or P4-eCG-based protocols. There was a greater OR, prolificacy and fecundity when there was use of the P4-eCG compared to longinterval PG-based protocols. Estrous-non-return rate after AI and fertility as a result TAI were not affected by either the supplementation or the estrous synchronization protocols used.  aOVEJAS  aREPRODUCCION ANIMAL  aEWE  aFERTILITY  aFOCUS FEEDING  aPROGESTERONE  aPROSTAGLANDIN  aTIMED ARTIFICIAL INSEMINATION1 aFIERRO, S.1 aALABART, J.L.1 aCLARAMUNT, M.1 aMINTEGUIAGA, M.A.1 aAUNCHAYNA, G.1 aERRANDONEA, N.1 aBANCHERO, G.  tAnimal Reproduction Science, July 2019, Volume 206, Pages 78-84.