{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T20:06:50Z","timestamp":1774469210449,"version":"3.50.1"},"reference-count":29,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2013,1,9]],"date-time":"2013-01-09T00:00:00Z","timestamp":1357689600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Animal Physiology Nutrition"],"published-print":{"date-parts":[[2014,2]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>This study was designed to study the effect of short\u2010term supplementation with rumen\u2010protected fat during the late luteal phase on reproduction and metabolism of sheep during breeding season. Seventy\u2010six ewes (<jats:styled-content style=\"fixed-case\">R<\/jats:styled-content>ahmani, <jats:styled-content style=\"fixed-case\">B<\/jats:styled-content>arki and <jats:styled-content style=\"fixed-case\">A<\/jats:styled-content>wassi\u00a0\u00d7\u00a0<jats:styled-content style=\"fixed-case\">B<\/jats:styled-content>arki) were allocated to two groups considering genotype: the control ewes (<jats:styled-content style=\"fixed-case\">C<\/jats:styled-content>\u2010group) received a maintenance diet, and the fat\u2010supplemented ewes (<jats:styled-content style=\"fixed-case\">F<\/jats:styled-content>\u2010group) received the maintenance diet plus 50\u00a0g\/head\/day of rumen\u2010 protected fat (<jats:styled-content style=\"fixed-case\">M<\/jats:styled-content>egalac) for 9\u00a0days during which oestrus was synchronized. The latter had been accomplished using double intramuscular injection of prostaglandin <jats:styled-content style=\"fixed-case\">F<\/jats:styled-content><jats:sub>2\u03b1<\/jats:sub> (<jats:styled-content style=\"fixed-case\">PGF<\/jats:styled-content><jats:sub>2\u03b1<\/jats:sub>) 11\u00a0days apart. Ovarian activity, serum concentration of cholesterol, glucose, insulin and reproductive performance variables were recorded. Data were analysed considering treatment (group) and genotype. Supplementation had positive effects on the overall mean serum concentrations of cholesterol (p<jats:italic>\u00a0<\/jats:italic>&lt;<jats:italic>\u00a0<\/jats:italic>0.05), glucose (p<jats:italic>\u00a0<\/jats:italic>&lt;<jats:italic>\u00a0<\/jats:italic>0.05) on day 6 of nutritional treatment and insulin (p<jats:italic>\u00a0<\/jats:italic>=<jats:italic>\u00a0<\/jats:italic>0.07) on day 8. Fat supplementation did not affect the total number of follicles, follicle populations and ovulation rate. However, fat\u2010supplemented <jats:styled-content style=\"fixed-case\">R<\/jats:styled-content>ahmani ewes tended to have higher ovulation rate compared with other breeds (treatment\u00a0\u00d7\u00a0breed interaction, p<jats:italic>\u00a0<\/jats:italic>=<jats:italic>\u00a0<\/jats:italic>0.06). Treatment also did not affect the mean concentration of serum estradiol or progesterone. Supplemented ewes had higher conception (p<jats:italic>\u00a0<\/jats:italic>=<jats:italic>\u00a0<\/jats:italic>0.06) and lambing rates (p<jats:italic>\u00a0<\/jats:italic>&lt;<jats:italic>\u00a0<\/jats:italic>0.05) compared with control. In conclusion, short\u2010term supplementation with rumen\u2010protected fat as a source of energy around breeding time improved metabolism, conception and lambing rates of ewes without effects on steroidogenic capacity and ovarian activity being apparent.<\/jats:p>","DOI":"10.1111\/jpn.12032","type":"journal-article","created":{"date-parts":[[2013,1,9]],"date-time":"2013-01-09T18:59:13Z","timestamp":1357757953000},"page":"65-71","source":"Crossref","is-referenced-by-count":14,"title":["Effect of short\u2010term supplementation with rumen\u2010protected fat during the late luteal phase on reproduction and metabolism of ewes"],"prefix":"10.1111","volume":"98","author":[{"given":"N. M.","family":"Hashem","sequence":"first","affiliation":[{"name":"Department of Animal Production Faculty of Agriculture Alexandria University Alexandria Egypt"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"S. Z.","family":"El\u2010Zarkouny","sequence":"additional","affiliation":[{"name":"Department of Animal Production Faculty of Agriculture Alexandria University Alexandria Egypt"},{"name":"Department of Arid Land Agriculture Faculty of Meteorology Environment and Arid Land Agriculture King Abdul\u2010Aziz University Jeddah Saudi Arabia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2013,1,9]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"191","article-title":"Net energy value for lactation of a dietary fat supplement fed to mature dairy cows","volume":"73","author":"Andrew S.","year":"1990","journal-title":"Journal of Dairy Science"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1098\/rstb.2009.0184"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.3168\/jds.S0022-0302(86)80535-5"},{"key":"e_1_2_6_5_1","unstructured":"Cullens F. 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