Potencial reprodutivo (PR) de touros Nelore avaliados por parâmetros andrológicos e comportamento sexual. Classificação por pontos: nova proposição

Fonseca, V. O.; Franco, Cynthia; Azevedo, N. A.; Oliveira, Letícia Zoccolaro; Monteiro, Gabriel Augusto; Cavalcanti, Luigi Francis Lima; Molina, L. R.

doi:10.1590/1678-4162-11061

Cited by 3 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The average semen quality traits (Table 4 ) of the bulls evaluated indicate a good reproductive potential for producing high-quality semen for artificial insemination purposes [ 21 ]. The averages observed are within the reproductive standards required by the Nellore cattle organizations in Brazil, in which MOT values are commonly expected to range from 50 to 75%, and VIG and TURB from 3 to 5 [ 22 ]. MOT is one of the most relevant semen quality traits due to its association with bull fertility [ 4 ].…”

Section: Discussionmentioning

confidence: 60%

See 1 more Smart Citation

Genetic parameters for various semen production and quality traits and indicators of male and female reproductive performance in Nellore cattle

et al. 2023

View full text Add to dashboard Cite

Background Given the economic relevance of fertility and reproductive traits for the beef cattle industry, investigating their genetic background and developing effective breeding strategies are paramount. Considering their late and sex-dependent phenotypic expression, genomic information can contribute to speed up the rates of genetic progress per year. In this context, the main objectives of this study were to estimate variance components and genetic parameters, including heritability and genetic correlations, for fertility, female precocity, and semen production and quality (andrological attributes) traits in Nellore cattle incorporating genomic information. Results The heritability estimates of semen quality traits were low-to-moderate, while moderate-to-high estimates were observed for semen morphological traits. The heritability of semen defects ranged from low (0.04 for minor semen defects) to moderate (0.30 for total semen defects). For seminal aspect (SMN_ASPC) and bull reproductive fitness (BULL_FIT), low (0.19) and high (0.69) heritabilities were observed, respectively. The heritability estimates for female reproductive traits ranged from 0.16 to 0.39 for rebreeding of precocious females (REBA) and probability of pregnancy at 14 months (PP14), respectively. Semen quality traits were highly genetically correlated among themselves. Moderate-to-high genetic correlations were observed between the ability to remain productive in the herd until four years of age (stayability; STAY) and the other reproductive traits, indicating that selection for female reproductive performance will indirectly contribute to increasing fertility rates. High genetic correlations between BULL_FIT and female reproductive traits related to precocity (REBA and PP14) and STAY were observed. The genetic correlations between semen quality and spermatic morphology with female reproductive traits ranged from -0.22 (REBA and scrotal circumference) to 0.48 (REBA and sperm vigor). In addition, the genetic correlations between REBA with semen quality traits ranged from -0.23 to 0.48, and with the spermatic morphology traits it ranged from -0.22 to 0.19. Conclusions All male and female fertility and reproduction traits evaluated are heritable and can be improved through direct genetic or genomic selection. Selection for better sperm quality will positively influence the fertility and precocity of Nellore females. The findings of this study will serve as background information for designing breeding programs for genetically improving semen production and quality and reproductive performance in Nellore cattle.

show abstract

Section: Discussionmentioning

confidence: 60%

“…Fonseca et al [ 22 ] evaluating 6,162 Nellore bulls for three andrological examination tests, reported averages of 3.01%, 4.63%, and 7.67% for major, minor, and total semen defects, respectively. In the same population, the temporary unfit and culling groups presented semen defects ranging from 8.54% to 39.03%.…”

Section: Discussionmentioning

confidence: 99%

Genetic parameters for various semen production and quality traits and indicators of male and female reproductive performance in Nellore cattle

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The mean EC was 32.40 ± 2.44, being considered excellent values according to Fonseca et al (2020). The averages found for VOL (4.74 ± 2.31), MOT (70.12 ± 7.69), VIG (3.52 ± 0.51), DT (17.13 ± 8.94), DMEN (5.20 ± 4.99) are within the ideal, but the TURB average (2.55 ± 1.04) was lower and the DMAI (11.93 ± 7.55) was above that proposed by CBRA (2013).…”

Section: Resultsmentioning

confidence: 92%

“…To choose animals that have greater reproductive capacity will result in an increase in the ratio of cows per bull, reducing production costs (FONSECA et al, 2020). One of the tools used for this is the andrological examination, which measures the fertility and reproductive potential of a bull (MARIANO et al;2015).…”

Section: Introductionmentioning

confidence: 99%

Correlation Between Testicular Morphometric Measures, Seminal Quality, Libido, Morphological Characteristics and Temperament of Breed Bulls ‘‘Gir Leiteiro’’

Martins¹,

Raymundo²,

Rios³

et al. 2022

JASR

View full text Add to dashboard Cite

show abstract

The importance of updated criteria in breeding soundness examination of commercial Nellore bulls for the herd reproductive improvement

Diniz

Teixeira

Riveros

et al. 2021

Arq. Bras. Med. Vet. Zootec.

Self Cite

View full text Add to dashboard Cite

The aim of this work was to compare results of breeding soundness examination (BSE) of Nellore bulls (n=1257) according to evaluation criteria from two different classification tables (traditional-Table1 used since 1997 and an updated-Table2-proposed in 2020). Data were separated into 3 categories: questionable animals in Table1 and Table2 (Q1Q2), animals approved in Table1 and questionable in Table2 (A1Q2) and animals approved in Table1 and Table2 (A1A2). BSE parameters were submitted to ANOVA (P<005), according to age groups. Higher (P<0.0001) scrotal perimeter (PE) were observed in A1A2 category (18-24m=33.4±2.4cm; 24-36m=34.5±2.2cm; 36-48m=36.6±1.7cm; >48m=38.6±1.7cm) compared to A1Q2 (18-24m=29.05±0.98cm; 24-36m=30.3±0.6cm; 36-48m=32.9±1.0cm; >48m=34.8±1.0cm) and to Q1Q2 (24-36m=26.8±2.0cm; 36-48m=30.0±0.1cm; >48m=31.3±1.1cm), for all age groups. At the age of 36-48months (Q1Q2=2.7±0.3; A1Q2=3.2±0.3; A1A2=3.3±0.6) and >48months (Q1Q2=3.0±0.4; A1Q2=3.3±0.5; A1A2=3.4±0.5), animals with better andrological classifications presented higher (P<0.05) body condition score (BCS). Additionally, at age >48m, higher sperm Motility (P=0.0250) and Vigor (P=0.0335) were observed in animals A1Q2 (Mot=55.5±14.7%; V=3.21±0.82) and A1A2 (Mot=55.8±12.2%; V=3.23±0.81) compared to Q1Q2 (Mot=50.2±17.4%; V=2.77±0.82). It was concluded that bulls approved using strict selection criteria demonstrated higher PE and BCS, regardless of the age. The utilization of updated classification tables is highly recommended for further reproductive potential development of Nellore bulls in the field.

show abstract

Potencial reprodutivo (PR) de touros Nelore avaliados por parâmetros andrológicos e comportamento sexual. Classificação por pontos: nova proposição

Cited by 3 publications

References 13 publications

Genetic parameters for various semen production and quality traits and indicators of male and female reproductive performance in Nellore cattle

Genetic parameters for various semen production and quality traits and indicators of male and female reproductive performance in Nellore cattle

Correlation Between Testicular Morphometric Measures, Seminal Quality, Libido, Morphological Characteristics and Temperament of Breed Bulls ‘‘Gir Leiteiro’’

The importance of updated criteria in breeding soundness examination of commercial Nellore bulls for the herd reproductive improvement

Contact Info

Product

Resources

About