127 Does selection for oocyte yield indirectly affect production traits in Gir cattle (Bos taurus indicus)?

2022 ◽  
Vol 34 (2) ◽  
pp. 301
Author(s):  
L. Feres ◽  
L. Siqueira ◽  
M. Palhao ◽  
L. Santos ◽  
L. Pfeifer ◽  
...  
Keyword(s):  
Bos Taurus ◽  
Production Traits ◽  
Oocyte Yield ◽  
Bos Taurus Indicus ◽  
Selection For

223 PREANTRAL FOLLICLES POPULATION IN BOS TAURUS INDICUS AND BOS TAURUS TAURUS FEMALES

2010 ◽  
Vol 22 (1) ◽  
pp. 269
Author(s):  
K. C. F. Silva ◽  
G. M. G. Santos ◽  
L.S. Siloto ◽  
M. F. Hertel ◽  
E. R. Andrade ◽  
...  
Keyword(s):  
Granulosa Cells ◽  
Bos Taurus ◽  
Science And Technology ◽  
Bos Indicus ◽  
Histological Evaluation ◽  
National Council ◽  
Crown Rump Length ◽  
Preantral Follicles ◽  
Oocyte Yield ◽  
Bos Taurus Indicus

Bos taurus indicus females provide a greater in vivo oocyte recovery (2-4 times more) in comparision with Bos taurus taurus. This aspect has strongly contributed for the success of the embryo industry in Brazil. Little information is available to explain this difference. Our objective was to test the hypothesis that the difference in oocyte yield is a result of higher numbers of preantral follicles in the ovaries of B. indicus females. Ovaries (n = 44) of fetuses aging from 180 to 240 days and of heifers from 20 and 24 months were collected from Bos taurus indicus (Nelore) and Bos taurus taurus (Aberdeen Angus) females at a slaughterhouse. Fetal age was estimated from the crown-rump length (Evans HE and Sack WO 1973 Anat. Hist. Embryol. 2, 11-45). Ovaries from Nelore fetuses (n = 10) and heifers (n = 12) and Aberdeen Angus fetuses (n = 10) and heifers (n = 12) were cut longitudinally into two halves, fixed in Bouin’s solution, and processed for histological evaluation. The ovarian halves were dehydrated in alcohol, cleared with xylene, embbebed in paraffin, and serially sectioned at 7 μm. Every 120th section was mounted and stained with periodic acid Schiff and hematoxylin. The number of preantral follicles was estimated through the counting of follicles in each section using the nucleus of the oocyte as a marker and a correction factor (Gougeon A and Chainy GBN 1987 J. Reprod. Fertil. 81, 433-442). Only 1 ovary per female was analyzed. Preantral follicles were classified according to the developmental stage as primordial (1 layer of flattened granulosa cells surrounding the oocyte), primary (1 layer of cuboidal granulosa cells), or secondary (2 or more layers of cuboidal granulosa cells), and as normal or degenerated according to their morphological appearance. The number of preantral follicles was not normally distributed and was compared using the Mann-Whitney test. There was no difference (P > 0.05) between the average number of preantral follicles in the ovaries of Bos indicus and Bos taurus females. The average number of preantral follicles per female was 143 929 ± 253 (mean ± SD) and 285 155 ± 570 for Bos taurus and Bos indicus fetuses, respectively, and 76 851 ± 280 and 109 673 ± 293 for Bos taurus and Bos indicus heifers (P > 0.05), respectively. A large variation in numbers of preantral follicles was observed among individuals within the same category and between breeds. Our results suggest that there might be differences in mechanisms controlling follicle development after the preantral stage accounting for the greater oocyte yield from Bos indicus females. This work was supported by grants from the Universidad Nacional del Litoral (CAI+D program), Universidad Nacional de Lomas de Zamora, the Argentine National Agency for the Promotion of Science and Technology (ANPCyT), and the Argentine National Council for Science and Technology (CONICET).

scholarly journals Effect of a single or two doses of an anti-GnRH vaccine on testicle morpho-functional characteristics in Nelore bulls

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Emanuel M. Doroteu ◽  
Joao H. M. Viana ◽  
Jair A. Ferreira Junior ◽  
Juliana T. A. Macedo ◽  
Rodrigo A. Oliveira ◽  
...  
Keyword(s):  
Bos Taurus ◽  
Active Immunization ◽  
Control Group ◽  
Histopathological Analysis ◽  
Sample Collection ◽  
Functional Characteristics ◽  
Scrotal Circumference ◽  
Bos Taurus Indicus ◽  
Boost Dose ◽  
And Control

AbstractThe aim of this study was to compare testicle morpho-functional characteristics in bulls undergoing a single or two immunizations against GnRH. Nelore (Bos taurus indicus) bulls were randomly allocated into three experimental groups: G1 (n=12), a single 400 μg dose of anti-GnRH vaccine on day 0; G2 (n=11), a first 400 μg dose of anti-GnRH vaccine on day 0 followed by a second (boost) dose 30 days later; and control group (CG, n=12), 1 mL saline 0.9% at day 0. Every 30 days, from day 0 until slaughter at day 90, the bulls were weighed and underwent testicular biometry, semen collection and analysis, and blood sample collection for testosterone measurement. Immediately after slaughter, the testicles were removed and transport at 15°C to the laboratory for histopathological analysis. There was a decrease in testicular height (P=0.0476), width (P=0.0021), and in scrotal circumference (P=0.0001), after either a single (G1) or two (G2) immunizations against GnRH. Both G1 and G2 had lower testosterone concentrations than CG from day 60 on (P<0.01), but in G2, it was also lower than in G1 at day 90 (P=0.0006). All sperm parameters were affected by active immunization against GnRH (P<0.05), and in G2, averages were lesser (P<0.05) than in G1 from day 60 on. No signs of seminiferous tubule degeneration were found in any sample from the CG, contrasting with 75.0% and 100.0% of the samples from G1 and G2, respectively. In summary, immunocastration affected testicle morpho-functional characteristics in bulls in a time- and dose-dependent way.

scholarly journals Fetal calf serum enhances in vitro production of Bos taurus indicus embryos

2011 ◽  
Vol 75 (3) ◽  
pp. 429-433 ◽  
Author(s):  
F.G. Leivas ◽  
D.S. Brum ◽  
S.S. Fialho ◽  
W.P. Saliba ◽  
M.T.T. Alvim ◽  
...  
Keyword(s):  
Fetal Calf Serum ◽  
Bos Taurus ◽  
Calf Serum ◽  
In Vitro Production ◽  
Bos Taurus Indicus ◽  
Vitro Production

Identification of novel candidate genes for age at first calving in Nellore cows using a SNP chip specifically developed for Bos taurus indicus cattle

2021 ◽  
Author(s):  
Miguel Angel Carabantes Dubom ◽  
Victor Breno Pedrosa ◽  
Fabieli Loise Braga Feitosa ◽  
Raphael Bermal Costa ◽  
Gregório Miguel Ferreira de Camargo ◽  
...  
Keyword(s):  
Candidate Genes ◽  
Bos Taurus ◽  
Age At First Calving ◽  
Snp Chip ◽  
Bos Taurus Indicus

scholarly journals Differential abundances of four forms of Binder of SPerm 1 in the seminal plasma of Bos taurus indicus bulls with different patterns of semen freezability

2016 ◽  
Vol 86 (3) ◽  
pp. 766-777.e2 ◽  
Author(s):  
Marcos Jorge Magalhães ◽  
Leonardo Franco Martins ◽  
Renato Lima Senra ◽  
Thaís Ferreira dos Santos ◽  
Denise Silva Okano ◽  
...  
Keyword(s):  
Seminal Plasma ◽  
Bos Taurus ◽  
Bos Taurus Indicus

scholarly journals Mitochondrial DNA of Nellore and European x Nellore crossing cattle of high performance

2007 ◽  
Vol 42 (8) ◽  
pp. 1203-1205 ◽  
Author(s):  
Rogério Abdallah Curi ◽  
Lígia Souza Lima Silveira da Mota ◽  
Antônio Carlos Silveira
Keyword(s):  
Mitochondrial Dna ◽  
High Frequency ◽  
High Performance ◽  
Bos Taurus ◽  
Meat Production ◽  
Bos Taurus Indicus ◽  
Nd5 Gene

The objective of this work was to evaluate, through a polymorphism in the ND5 gene of the bovine mitochondrial DNA, the frequency of Bos taurus indicus mtDNA individuals in a sample of Nellore purebred origin animals (n = 69) and crossbred animals originated from crosses of European sires and Nellore purebred origin females (n = 275). Only 2.26% (8/354) of the animals presented Bos taurus indicus mtDNA. The high frequency of Bos taurus taurus mtDNA in these animals can be a consequence of selection, once the animals studied are originated from selected lineages of high performance for meat production.

scholarly journals PROPORÇÃO DO SEXO NA PRODUÇÃO IN VITRO DE EMBRIÕES BOVINOS

2015 ◽  
Vol 20 (2) ◽  
Author(s):  
Marcus Vinícius Galvão Loiola ◽  
Alexandra Soares Rodrigues ◽  
Marcos Chalhoub ◽  
Priscila Assis Ferraz ◽  
Rodrigo Freitas Bittencourt ◽  
...  
Keyword(s):  
Bos Taurus ◽  
Bos Taurus Indicus

Objetivou-se avaliar a proporção do sexo utilizando espermatozoides provenientes de sêmen convencional ou sexado para fêmea em um programa de produção in vitro de embriões (PIVE) bovinos. Foram utilizados oócitos de 87 doadoras Bos taurus indicus da raça Nelore, obtidos por sistema de aspiração folicular transvaginal guiado por ultrassonografia. Os oócitos selecionados foram maturados in vitro, fertilizados com espermatozoides oriundos de sêmen convencional (grupo 1 – CONV) ou sêmen sexado para fêmea (grupo 2 – SEX) e os embriões produzidos foram então cultivados in vitro por sete dias. Após o cultivo, os mesmos foram envasados e inovulados em receptoras mestiças Bos taurus taurus x Bos taurus indicus. Foram transferidos 1.319 embriões, sendo 1.081 produzidos com sêmen convencional (CONV) e 238 com sêmen sexado de fêmea (SEX). O diagnóstico precoce de gestação e a sexagem fetal foram realizados por ultrassonografia transretal. A taxa de gestação total foi 37,38% (493/1.319), sendo 37,74% (408/1.081) no grupo CONV e 35,71% (85/238) no grupo SEX. A proporção do sexo no grupo CONV foi desviada (P=0,002) a favor dos machos (57,84% de machos e 42,16% de fêmeas) e no grupo SEX ocorreu um desvio na proporção (P=0,001) a favor das fêmeas (68,24% de fêmeas e 31,76% de machos). Concluiu-se que a utilização do sêmen convencional em PIVE bovinos elevou a proporção de produtos machos e apesar da utilização de sêmen sexado de fêmea ser uma alternativa para pré-selecionar o sexo dos produtos, ainda houve uma considerável taxa de machos quando se utilizou este tipo de sêmen.

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