{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T00:24:53Z","timestamp":1787876693028,"version":"build-2784847793"},"reference-count":43,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2020,12,3]],"date-time":"2020-12-03T00:00:00Z","timestamp":1606953600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Reprod Domestic Animals"],"published-print":{"date-parts":[[2021,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The purpose of this study was to analyse the effects of season, age, gonad and accessory sex glands on semen characteristics of jackass and to construct multivariate regression models to predict semen quality. In autumn, spring and summer, semen characteristics of 30 sexually mature donkeys (1,014 ejaculations) were analysed to investigate the effect of seasons on semen quality, and gonad and accessory sex gland parameters of 12 jackasses were measured immediately after ejaculation by ultrasonography to investigate the effect of seasons on reproductive organ size. Semen (598 ejaculates), gonad and accessory sex gland parameters of 40 jackasses aged between 3 and 7\u00a0years were analysed in autumn to investigate the effects of age and reproductive organ size on semen quality and to construct multivariate models. To verify the accuracy of the models, semen (476 ejaculates), gonad and accessory sex gland parameters of 20 jackasses were measured from March to June. Results revealed that semen, gonad and accessory sex gland parameters were not affected by season and age. Progressive motility (PM) was positively correlated with long axis of the spermatic cord (LASC) and negatively correlated with percentages of sperm abnormality (PSA). Total sperm count (TSC) was positively correlated with testis circumferences (TC) and cross\u2010sectional area of cauda epididymis (CSACE). TC, CSACE, LASC and PSA were included into multivariate models to predict PM, TSC and functional sperm count (FSC) in 20 jackasses (PM\u00a0=\u00a072.332\u00a0+\u00a00.428 LASC\u00a0\u2212\u00a00.441 PSA; TSC\u00a0=\u00a0\u2212169.929\u00a0+\u00a08.728 TC\u00a0+\u00a00.253 CSACE; FSC\u00a0=\u00a0\u2212206.645\u00a0+\u00a08.788 TC\u00a0+\u00a00.258 CSACE). The predicted and observed values corresponded well. In conclusion, the tested models can be used for predicting semen quality of donkey.<\/jats:p>","DOI":"10.1111\/rda.13842","type":"journal-article","created":{"date-parts":[[2020,10,17]],"date-time":"2020-10-17T18:52:49Z","timestamp":1602960769000},"page":"301-312","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Multivariate models for estimating jackass semen production and quality"],"prefix":"10.1111","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2452-1121","authenticated-orcid":false,"given":"Qing","family":"Liu","sequence":"first","affiliation":[{"name":"Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology Yangzhou University Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Yu","sequence":"additional","affiliation":[{"name":"College of Animal Science and Technology Northwest Agriculture &amp; Forestry University Yangling China"},{"name":"National Engineering Research Center for Gelatin\u2010based Traditional Chinese Medicine Dong\u2010E\u2010E\u2010Jiao Co. 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Liaocheng China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peng","family":"Gao","sequence":"additional","affiliation":[{"name":"National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology China Agricultural University Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guanglei","family":"Cong","sequence":"additional","affiliation":[{"name":"Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology Yangzhou University Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daiyong","family":"Cui","sequence":"additional","affiliation":[{"name":"Key Laboratory for Animal Genetics, Breeding, Reproduction and Molecular Design, College of Animal Science and Technology Yangzhou University Yangzhou China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chuanliang","family":"Ji","sequence":"additional","affiliation":[{"name":"National Engineering Research Center for Gelatin\u2010based Traditional Chinese Medicine Dong\u2010E\u2010E\u2010Jiao Co. 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