Evaluation and prediction of scrotal circumference in beef bulls

被引:8
作者
Menegassi, Silvio R. O. [1 ]
Pereira, Gabriel R. [1 ]
McManus, Concepta [2 ]
Roso, Vanerlei M. [3 ]
Bremm, Carolina [1 ]
Koetz, Celso, Jr. [4 ]
Lopes, Jusecleia F. [1 ]
Barcellos, Julio O. J. [1 ]
机构
[1] Univ Fed Rio Grande do Sul, Dept Anim Sci, Bento Gonsalves Ave 7712, BR-91540000 Porto Alegre, RS, Brazil
[2] Univ Brasilia, Dept Anim Sci, Darcy Ribeiro Univ Campus, BR-70910900 Brasilia, DF, Brazil
[3] GenSys Consultores Associados SC Ltda, Guilherme Alves St 170, BR-90450190 Porto Alegre, RS, Brazil
[4] Univ Northern Parana, Coll Vet Med, Paris Ave 675, BR-86041120 Londrina, Parana, Brazil
关键词
Beef cattle; Genetic evaluation; Puberty; Scrotal circumference; Bulls; BREEDING SOUNDNESS EXAMINATION; GENETIC-PARAMETERS; SEXUAL DEVELOPMENT; TESTICULAR DEVELOPMENT; METABOLIC HORMONES; SEMEN QUALITY; ADJUSTMENT FACTORS; SPERM PRODUCTION; GROWTH TRAITS; AGE;
D O I
10.1016/j.theriogenology.2019.08.008
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Scrotal circumference (SC) is considered a useful tool for predicting age at puberty and is performed to improve the reproductive performance in beef cattle industry. We aimed to fit several nonlinear mixed models for SC measurements of five different breeds to better predict testicular growth. Data of SC (cm), body weight (BW; kg), and age (A; days), farm location, sire and dam, and birth dates of 169,094 beef bulls were collected from five breeds: Nelore (N) (n = 110,814); Angus (AA) (n = 6541); Brangus (BA) (n = 42,910); Polled Hereford and Hereford (HH) (n = 4640); and Braford (BH) (n = 7480). Data comprise a total of 8640 sires and 115,172 dams and grouped in 2908 contemporary groups (CG). The full model development for SC was defined as: SC = CG + A + A*A + BW + BW*BW + epsilon. Bulls from HH (34.1 +/- 3.2) and AA (33.5 +/- 3.0) had the highest value of SC, followed by BH (32.2 +/- 3.7), BA (30.6 +/- 4.1), and N (26.9 +/- 3.6). There was a curvilinear effect of BW on the SC measurements of HH and AA bulls, reaching the maximum point around 600 kg, whether both breeds presented a similar testicular growth pattern. In British breeds, inflection points of average daily SC growth of 0.039 and 0.042 cm/kg were obtained from 700 kg HH and 600 kg AA bulls, respectively. Scrotal circumference values of 0.042 and 0.046 cm/kg reaching the maximum growth point at 450 kg BW were obtained for BH and BA bulls, respectively. We also observed SC values of 0.044 and 0.048 cm/d reaching the maximum growth point at 550 d of age for BH and BA bulls, respectively. Thus, estimate testicular size at maturity should be measured between 500 and 600 kg BW in British genotypes and between 550 and 600 d in Bos indices and crossbreeds animals. Therefore, SC adjustment can be used by breed-specific criteria associated with BW and/or age to determine testis growth as a selection criterion in beef cattle breeding programs. (C) 2019 Elsevier Inc. All rights reserved.
引用
收藏
页码:25 / 32
页数:8
相关论文
共 50 条
[41]   Heritability index of body weight and scrotal circumference in young crossbred bulls [J].
Cuéller, LY ;
Bury, NM ;
Durán, RC ;
Urdaneta, ER .
REVISTA CIENTIFICA-FACULTAD DE CIENCIAS VETERINARIAS, 1999, 9 (03) :180-189
[42]   Estimation of correction factors of scrotal circumference for age and body weight in young Nellore breed bulls [J].
Peña, CDO ;
de Queiroz, SA ;
Fries, LA .
REVISTA BRASILEIRA DE ZOOTECNIA-BRAZILIAN JOURNAL OF ANIMAL SCIENCE, 2000, 29 (06) :1667-1675
[43]   Can scrotal circumference-based selection discard bulls with good productive and reproductive potential? [J].
Penitente-Filho, Jurandy Mauro ;
Castano Villadiego, Faider Alberto ;
Fonseca e Silva, Fabyano ;
Camilo, Breno Soares ;
Leon, Victor Gomez ;
Peixoto, Thiago ;
Diaz, Edgar ;
Okano, Denise ;
Maitan, Paula ;
Lima, Daniel ;
Guimaraes, Simone Facioni ;
Siqueira, Jeanne Broch ;
Pinho, Rogerio ;
Guimaraes, Jose Domingos .
PLOS ONE, 2018, 13 (03)
[44]   Relationship of age to body weight, scrotal circumference, testicular ultrasonograms, and semen quality in Sahiwal bulls [J].
Ejaz Ahmad ;
Nasim Ahmad ;
Zahid Naseer ;
Muhammad Aleem ;
Muhammad Sarwar Khan ;
Muhammad Ashiq ;
Muhammad Younis .
Tropical Animal Health and Production, 2011, 43 :159-164
[45]   Effect of age and body weight on scrotal circumference and testicular growth in Nagaland swamp buffalo bulls [J].
Perumal, P. .
INDIAN JOURNAL OF ANIMAL SCIENCES, 2018, 88 (07) :35-40
[46]   Adjustment factors for scrotal circumference at yearling for crossbred Aberdeen Angus x Nelore young bulls [J].
Lopes, J. S. ;
Rorato, P. R. N. ;
Weber, T. ;
Comin, J. G. ;
Araujo, R. O. .
ARQUIVO BRASILEIRO DE MEDICINA VETERINARIA E ZOOTECNIA, 2009, 61 (02) :413-419
[47]   Infrared thermography as a noninvasive method to assess scrotal insulation on sperm production in beef bulls [J].
Menegassi, S. R. O. ;
Pereira, G. R. ;
Dias, E. A. ;
Rocha, M. K. ;
Carvalho, H. R. ;
Koetz, C., Jr. ;
Oberst, E. R. ;
Barcellos, J. O. J. .
ANDROLOGIA, 2018, 50 (03)
[48]   Scrotal Circumference Growth Curves of Buffalo Bulls of Different Breeds Raised in Brazil [J].
Henry, Marc ;
Brito, Mayara Ferreira ;
Loaiza-Echeverri, Ana Maria ;
Sousa De Oliveira, Cairo Henrique ;
Bagarrao Gibson, Andre Felipe ;
Neves, Beatriz Parzewski ;
Andrade, Guilherme De Oliveira ;
Melo, Isabela Oliveira ;
Bastianetto, Eduardo .
BUFFALO BULLETIN, 2013, 32 :439-442
[49]   Effects of cytoplasmic line on scrotal circumference and semen quality traits in Angus bulls [J].
Garmyn, A. G. ;
Moser, D. W. .
JOURNAL OF ANIMAL SCIENCE, 2007, 85 :15-16
[50]   Relationship of age and body weight with scrotal circumference in Murrah buffalo bulls/males [J].
Singh, Pawan ;
Singh, Inderjeet ;
Singh, Kalyan ;
Singh, Sajjan ;
Phulia, S. K. .
INDIAN JOURNAL OF ANIMAL SCIENCES, 2010, 80 (05) :418-421