title: Effects of choice of month of treatment and parity order on bovine superovulation traits.
abstract: In this study, the performance of 300 Changbaishan Black cattle treated for superovulation from June to September was evaluated to determine the optimal conditions and herds for bovine embryo production. Data analysis revealed that cattle treated in July and August had higher numbers of available embryos (NAE), M1 embryos (NM1), and total embryos (NTE), as well as a higher percentage of M1 embryos (PM1). The temperature and precipitation observed during July and August were greater than those seen in the other two months; strong correlations were observed between these traits and the choice of month of treatment. In addition, multiparous cattle showed a better performance, higher NTE, NAE, NM1, and PM1 values, higher percentages of available embryos, and a lower percentage of degenerated embryos. The co-efficient correlation analysis showed that the month chosen for the treatment did not affect the superovulation traits of nulliparous cattle; however, the choice of the month affected multiparous cattle. Multiparous and nulliparous cattle exhibited many significant differences when treated in July and in August. In addition, the superovulatory traits of multiparous cattle, and not the nulliparous cattle, were strongly correlated to the choice of month of treatment. The results suggested that superovulation is more effective during a period with appropriate environmental temperature and humidity, and that multiparous cattle are more suitable for morula production.
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: Q
authors.initials: Q
authors.lastname: Deng
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Gao
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: C H
authors.initials: CH
authors.lastname: Li
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: X F
authors.initials: XF
authors.lastname: Yu
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: J S
authors.initials: JS
authors.lastname: Ren
authors.affiliation: Hebei Tianhe Beef Cattle Farming Ltd., Shijiazhuang, China.
authors.forename: S J
authors.initials: SJ
authors.lastname: Li
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: C Z
authors.initials: CZ
authors.lastname: Chen
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: B
authors.initials: B
authors.lastname: Yuan
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Ding
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China.
authors.forename: H
authors.initials: H
authors.lastname: Jiang
authors.affiliation: College of Animal Sciences, Jilin University, Changchun, China zhangjiabao515@163.com.
authors.forename: J B
authors.initials: JB
authors.lastname: Zhang
mesh_terms: D000818:Animals; D002417:Cattle / Q000235:genetics* / Q000502:physiology; D004624:Embryo Transfer; D005260:Female; D005640:Follicle Stimulating Hormone / Q000008:administration & dosage; D010298:Parity; D010641:Phenotype; D011247:Pregnancy; D011891:Rain; D013472:Sunlight; D013480:Superovulation / Q000187:drug effects / Q000235:genetics*; D013696:Temperature; D013997:Time Factors
chemical_list: D005640:Follicle Stimulating Hormone