Perdas reprodutivas e reconcepção em bovinos de corte segundo a idade ao acasalamento

Gottschall, C.; Ferreira, Eduardo Henrique Barros; Canellas, Leonardo Canali; Bittencourt, Hélio Radke

doi:10.1590/s0102-09352008000200021

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…The success rate of rebreeding after first calving is a major issue in beef cattle farming. Several studies have reported significant reductions in calving rates between the first and second services [ 6 – 8 ]. Mercadante et al [ 9 ] observed reductions of up to 20 % in calving rates from the first to the second conception of Nellore females.…”

Section: Introductionmentioning

confidence: 99%

Genome-wide association study of reproductive traits in Nellore heifers using Bayesian inference

et al. 2015

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BackgroundAn important goal of Zebu breeding programs is to improve reproductive performance. A major problem faced with the genetic improvement of reproductive traits is that recording the time for an animal to reach sexual maturity is costly. Another issue is that accurate estimates of breeding values are obtained only a long time after the young bulls have gone through selection. An alternative to overcome these problems is to use traits that are indicators of the reproductive efficiency of the herd and are easier to measure, such as age at first calving. Another problem is that heifers that have conceived once may fail to conceive in the next breeding season, which increases production costs. Thus, increasing heifer’s rebreeding rates should improve the economic efficiency of the herd. Response to selection for these traits tends to be slow, since they have a low heritability and phenotypic information is provided only later in the life of the animal. Genome-wide association studies (GWAS) are useful to investigate the genetic mechanisms that underlie these traits by identifying the genes and metabolic pathways involved.ResultsData from 1853 females belonging to the Agricultural Jacarezinho LTDA were used. Genotyping was performed using the BovineHD BeadChip (777 962 single nucleotide polymorphisms (SNPs)) according to the protocol of Illumina - Infinium Assay II ® Multi-Sample HiScan with the unit SQ ™ System. After quality control, 305 348 SNPs were used for GWAS. Forty-two and 19 SNPs had a Bayes factor greater than 150 for heifer rebreeding and age at first calving, respectively. All significant SNPs for age at first calving were significant for heifer rebreeding. These 42 SNPs were next or within 35 genes that were distributed over 18 chromosomes and comprised 27 protein-encoding genes, six pseudogenes and two miscellaneous noncoding RNAs.ConclusionsThe use of Bayes factor to determine the significance of SNPs allowed us to identify two sets of 42 and 19 significant SNPs for heifer rebreeding and age at first calving, respectively, which explain 11.35 % and 6.42 % of their phenotypic variance, respectively. These SNPs provide relevant information to help elucidate which genes affect these traits.

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Section: Introductionmentioning

confidence: 99%

Genome-wide association study of reproductive traits in Nellore heifers using Bayesian inference

et al. 2015

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“…A inseminação artificial (IA) é a biotecnologia que mais se destaca e mais é utilizada nas propriedades produtoras de leite, sendo também a responsável por causar maior impacto econômico na produção de bovinos de leite, devido a possibilidade de viabilizar o ganho da heterose através do cruzamento industrial em regiões tropicais e utilizar em massa reprodutores de alto desempenho e melhoradores genéticos (GOTTSCHALL et al, 2008).…”

Section: Revisãounclassified

Advantages and Challenges of Implementing Reproductive Biotechniques in the West Goiano Dairy Apl

Rodrigues Andrade,

Ferreira de Oliveira,

Althair Ribeiro Cordeiro

et al. 2023

jid

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Considering the current market for cattle farming, it is necessary to implement reproductive technologies and biotechnologies on a property. In this sense, BIOTEC activities to bring these biotechnologies to small producers in APL Oeste, this work aims to show the main benefits and difficulties encountered in this implementation. These highlighted benefits and difficulties are based on the experience of the institution’s veterinarians and interns during activities on APL Oeste properties, in terms of what else is needed both to improve results after the implementation of biotechnologies, and productivity itself. The difficulties of a structural, nutritional and management nature are highlighted, and the main benefits are the genetic improvement and zootechnical control of animals, which shows that there is still a lot to improve so that these activities can reach more producers and improve their results in those that are already in the project.

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“…Animais da raça G diferiram (P<0,05) desses grupos, com taxas de concepção de 9,09% e taxa de reconcepção de 0%. (Almeida et al, 2002;Gottschall et al, 2008). As fêmeas dos grupos GN e AN apresentaram, ao início da segunda estação de monta, pesos e escores corporais superiores às fêmeas da raça G, embora sem diferença (P<0,05) entre G e GN.…”

Section: Nos Cruzamentos Com Bos Taurus Indicusunclassified

Taxa de fertilidade de novilhas de diferentes grupos genéticos com primeiro serviço aos 14 meses de idade

Sollecito¹,

Andrade

Barbosa

et al. 2016

Arq. Bras. Med. Vet. Zootec.

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Foram avaliadas as taxas de reconcepção de 98 novilhas primíparas (34 Guzerá - G, 32, 1/2 Guzerá x 1/2 Nelore - GN e 32,1/2 Red Angus x 1/2 Nelore - AN) com 14 meses de idade e peso médio de aproximadamente 249,65kg, criadas em pastos de Brachiaria brizantha cv Marandu. Na segunda estação de monta (EM), foram utilizadas apenas as 36 primíparas gestantes na primeira EM (três G, nove GN e 24 AN), com média de idade de 26 meses e peso corporal de 313,67±25,01kg, 336,50±45,84kg e 399,86±44,45kg, respectivamente, para as fêmeas dos grupos G, GN e AN. O grupo AN apresentou ganho médio diário (GMD) de 0,30±0,06 (kg/dia) e maiores taxas (58,33) de reconcepção (P<0,05), comprovando que a heterose resultante do cruzamento entre raças distintas com maior distância genética (Bos taurus taurus x Bos taurus indicus) proporciona maior desempenho produtivo e reprodutivo.

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Perdas reprodutivas e reconcepção em bovinos de corte segundo a idade ao acasalamento

Cited by 5 publications

References 13 publications

Genome-wide association study of reproductive traits in Nellore heifers using Bayesian inference

Genome-wide association study of reproductive traits in Nellore heifers using Bayesian inference

Advantages and Challenges of Implementing Reproductive Biotechniques in the West Goiano Dairy Apl

Taxa de fertilidade de novilhas de diferentes grupos genéticos com primeiro serviço aos 14 meses de idade

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