{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T16:43:13Z","timestamp":1790872993496,"version":"4.1.0"},"reference-count":24,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2006,1,12]],"date-time":"2006-01-12T00:00:00Z","timestamp":1137024000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Reprod Domestic Animals"],"published-print":{"date-parts":[[2006,2]]},"abstract":"<jats:title>Contents<\/jats:title><jats:p>The investigation was carried out to study the impact of melatonin and <jats:sc>l<\/jats:sc>\u2010tyrosine administration on the onset of cyclicity in delayed pubertal ewe\u2010lambs. Fifteen delayed pubertal ewe\u2010lambs (age &gt;16\u2003months) were used in this study after being assigned randomly into three groups. In the first group (melatonin treated group, n\u2003=\u20035), each lamb was administered 3\u2003mg melatonin orally at 16:00\u2003hours from 1 July to 15 September while in the second group (<jats:sc>l<\/jats:sc>\u2010tyrosine treated group, n\u2003=\u20035), each lamb was administered <jats:sc>l<\/jats:sc>\u2010tyrosine at the level of 100\u2003mg\/kg b.w. as a single oral dose. The third group (n\u2003=\u20034) served as control. Lambs were exposed to mature, fertile rams daily and blood samples were collected twice weekly. The progesterone concentrations (P<jats:sub>4<\/jats:sub> evaluations) were significantly higher (p\u2003&lt;\u20030.05) in treated groups than the control group. Ovarian activity, assessed by P<jats:sub>4<\/jats:sub> evaluations, showed that all animals in the first group came in oestrus and from them four got pregnant (80%) while in the second group, only three lambs came in heat and from them two became pregnant (40%). On the contrary, none of the control lambs showed oestrus. In conclusion, this study confirmed that the oral administration of melatonin and <jats:sc>l<\/jats:sc>\u2010tyrosine played an essentially physiological roles to induce cyclicity in delayed pubertal ewe\u2010lambs and improved their reproduction.<\/jats:p>","DOI":"10.1111\/j.1439-0531.2006.00600.x","type":"journal-article","created":{"date-parts":[[2006,1,12]],"date-time":"2006-01-12T15:54:11Z","timestamp":1137081251000},"page":"1-4","source":"Crossref","is-referenced-by-count":4,"title":["Reproductive and Endocrine Characteristics of Delayed Pubertal Ewe\u2010Lambs after Melatonin and <scp>l<\/scp>\u2010Tyrosine Administration"],"prefix":"10.1111","volume":"41","author":[{"given":"KA","family":"El\u2010Battawy","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2006,1,12]]},"reference":[{"key":"e_1_2_6_2_1","first-page":"475","volume-title":"Radioassay Systems in Clinical Endocrinology","author":"Abraham GE","year":"1981"},{"key":"e_1_2_6_3_1","doi-asserted-by":"crossref","first-page":"211","DOI":"10.21608\/avmj.1991.208519","article-title":"L\u2010tyrosine and ovarian activity in Egyptian buffaloes","volume":"25","author":"El\u2010Amrawi GA","year":"1991","journal-title":"Assiut Vet. 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