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Crossbred bull selection for bigger scrotum and shorter age at puberty with potentials for better quality semen.
Reprod Domest Anim 2008; 43(1):74-9RD

Abstract

Shortening age at puberty of crossbred breeding bull is an important issue in the tropics. This study aimed at selecting crossbred bulls at earliest possible age with bigger scrotum and potential for donating quality semen. One hundred and 31 pre-joining crossbred bulls of Central Artificial Insemination Laboratory, Saver, Dhaka were examined. The bulls being trained by seeing semen collection from mature bulls were allowed ejaculation into the artificial vagina at homosexual mount during a 20 min time at three occasions, every three months. Eighty one of 131 bulls produced at least one ejaculate during the study and their mean +/- SD age and scrotal circumference (SC) were 20.3 +/- 4.7 months and 28.2 +/-2.7 cm, respectively. Bulls' body weight, body condition score (BCS) and SC influenced the attainment of their puberty (p < 0.05). Bull's body weight had positive effects on scrotal circumference and ejaculate volume (p < 0.05). Scrotal circumference positively influenced the percentages of normal spermatozoa (p < 0.05). Scrotal skin-fold thickness negatively influenced the proportion of spermatozoa with normal head (p < 0.05). Based on age at first ejaculate and SC, 29.6% bulls (n = 24) were selected by cluster analysis. Selected bulls had mean +/- SD age 17.9 +/- 2.2 months, body weight 287.3 +/-48.6 kg, SC 30.5 +/- 1.5 cm, ejaculate volume 3.4 +/- 1.3 ml, sperm motility 50.8 +/- 17.2%, total spermatozoa per ejaculate 2541.9 +/- 1699.2 million and normal spermatozoa 81.5 +/-14.5%. The selected pubertal bull group was different from the unselected pubertal bulls at MANOVA (p < 0.0001). About 30% of pubertal crossbred bulls can be selected with shorter age and larger scrotum at puberty under conditions prevailed in Bangladesh.

Authors+Show Affiliations

Department of Surgery and Obstetrics, Faculty of Veterinary Science, Bangladesh Agricultural University, Mymensingh, Bangladesh.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18199262

Citation

Siddiqui, M A R., et al. "Crossbred Bull Selection for Bigger Scrotum and Shorter Age at Puberty With Potentials for Better Quality Semen." Reproduction in Domestic Animals = Zuchthygiene, vol. 43, no. 1, 2008, pp. 74-9.
Siddiqui MA, Bhattacharjee J, Das ZC, et al. Crossbred bull selection for bigger scrotum and shorter age at puberty with potentials for better quality semen. Reprod Domest Anim. 2008;43(1):74-9.
Siddiqui, M. A., Bhattacharjee, J., Das, Z. C., Islam, M. M., Islam, M. A., Haque, M. A., ... Shamsuddin, M. (2008). Crossbred bull selection for bigger scrotum and shorter age at puberty with potentials for better quality semen. Reproduction in Domestic Animals = Zuchthygiene, 43(1), pp. 74-9. doi:10.1111/j.1439-0531.2007.00857.x.
Siddiqui MA, et al. Crossbred Bull Selection for Bigger Scrotum and Shorter Age at Puberty With Potentials for Better Quality Semen. Reprod Domest Anim. 2008;43(1):74-9. PubMed PMID: 18199262.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Crossbred bull selection for bigger scrotum and shorter age at puberty with potentials for better quality semen. AU - Siddiqui,M A R, AU - Bhattacharjee,J, AU - Das,Z C, AU - Islam,M M, AU - Islam,M A, AU - Haque,M A, AU - Parrish,J J, AU - Shamsuddin,M, PY - 2008/1/18/pubmed PY - 2008/4/9/medline PY - 2008/1/18/entrez SP - 74 EP - 9 JF - Reproduction in domestic animals = Zuchthygiene JO - Reprod. Domest. Anim. VL - 43 IS - 1 N2 - Shortening age at puberty of crossbred breeding bull is an important issue in the tropics. This study aimed at selecting crossbred bulls at earliest possible age with bigger scrotum and potential for donating quality semen. One hundred and 31 pre-joining crossbred bulls of Central Artificial Insemination Laboratory, Saver, Dhaka were examined. The bulls being trained by seeing semen collection from mature bulls were allowed ejaculation into the artificial vagina at homosexual mount during a 20 min time at three occasions, every three months. Eighty one of 131 bulls produced at least one ejaculate during the study and their mean +/- SD age and scrotal circumference (SC) were 20.3 +/- 4.7 months and 28.2 +/-2.7 cm, respectively. Bulls' body weight, body condition score (BCS) and SC influenced the attainment of their puberty (p < 0.05). Bull's body weight had positive effects on scrotal circumference and ejaculate volume (p < 0.05). Scrotal circumference positively influenced the percentages of normal spermatozoa (p < 0.05). Scrotal skin-fold thickness negatively influenced the proportion of spermatozoa with normal head (p < 0.05). Based on age at first ejaculate and SC, 29.6% bulls (n = 24) were selected by cluster analysis. Selected bulls had mean +/- SD age 17.9 +/- 2.2 months, body weight 287.3 +/-48.6 kg, SC 30.5 +/- 1.5 cm, ejaculate volume 3.4 +/- 1.3 ml, sperm motility 50.8 +/- 17.2%, total spermatozoa per ejaculate 2541.9 +/- 1699.2 million and normal spermatozoa 81.5 +/-14.5%. The selected pubertal bull group was different from the unselected pubertal bulls at MANOVA (p < 0.0001). About 30% of pubertal crossbred bulls can be selected with shorter age and larger scrotum at puberty under conditions prevailed in Bangladesh. SN - 0936-6768 UR - https://www.unboundmedicine.com/medline/citation/18199262/Crossbred_bull_selection_for_bigger_scrotum_and_shorter_age_at_puberty_with_potentials_for_better_quality_semen_ L2 - https://doi.org/10.1111/j.1439-0531.2007.00857.x DB - PRIME DP - Unbound Medicine ER -