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Advances in animal biosciences 22건

  1. [해외논문]   Analysis of suckler cow reproductive performance and its contribution to financial performance on Irish beef farms  

    Taylor, R. F. , McGee, M. , Crosson, P. , Kelly, A. K.
    Advances in animal biosciences v.8 suppl.1 ,pp. s64 - s66 , 2017 , 2040-4700 ,

    초록

    The aim of this study was to analyse cow reproductive performance on 37 Irish suckler beef farms and determine how reproductive efficiency influences farm profitability. The main reproductive factors associated with gross output value per livestock unit (GO/LU) were average age at first calving ( r = −0.19, P r = −0.15, P r = 0.21, P r = 0.18, P r = 0.21, P

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  2. [해외논문]   Comparison of rolled barley with citrus pulp as a supplement for growing cattle offered grass silage  

    Lenehan, C. , Moloney, A. P. , O'Riordan, E. G. , Kelly, A. , McGee, M.
    Advances in animal biosciences v.8 suppl.1 ,pp. s33 - s37 , 2017 , 2040-4700 ,

    초록

    This study aimed to examine the effects of replacing rolled barley (high in starch) with citrus pulp (high in digestible fibre) in a supplement on intake and performance of young growing cattle offered grass silage ad libitum for 101 days. Weaned, early- and late-maturing breed, male suckled beef calves ( n = 120) were blocked by sire breed, gender and weight and from within block randomly assigned to one of two concentrate supplements based mainly on rolled barley (BAR) or citrus pulp (CIT) and formulated to have similar concentrations of true protein digestible in the small intestine. On day 87, blood samples were taken before and 2 h after feeding, and rumen fluid samples were collected 2 h post-feeding. Supplement type did not affect ( P >0.05) grass silage intake, live weight gain, final live weight, ultrasonically assessed body composition or measurements of skeletal size. Rumen pH (6.64 v . 6.79), ammonia (51 v . 81 mg/l) and acetate-to-propionate ratio (2.7 v . 3.2) were lower ( P

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  3. [해외논문]   Influence of population structure on the compilation of the Bonsmara genomic reference population  

    Bosman, L. , van der Westhuizen, R. R. , Visser, C. , van Marle-Kö , ster, E.
    Advances in animal biosciences v.8 suppl.1 ,pp. s45 - s47 , 2017 , 2040-4700 ,

    초록

    The most popular beef breed in South Africa is the Bonsmara, a locally developed composite breed adapted to sub-tropical conditions. The establishment of a genomic reference population is currently ongoing for the application of genomic selection. To date, 583 Bonsmara cattle (388 bulls and 195 cows) have been genotyped with the GeneSeek ? Genomic Profiler Bovine HD™ Chip (GGP-HD) 80 K chip, and the population structure of the reference population was studied. The average minor allele frequency for the Bonsmara was 0.280 across 56 248 autosomal single-nucleotide polymorphisms (SNPs), whereas the observed and expected heterozygosity values were 0.361 and 0.365, respectively. After pruning the data set for SNPs in linkage disequilibrium, 19 119 SNPs were retained, averaging 659 SNPs per autosomal chromosome. This generated an average SNP density of 1 SNP per 90 kb. Structure analysis revealed a non-homogenous population with a high level of genetic admixture, which may negatively influence genomic breeding value prediction accuracy. Genotyping of a further 990 Bonsmara cattle are pending, using the GeneSeek ? GGP-HD 150 K chip. As more animals will be added to the reference population, the profile of the reference population are expected to change in such a way to ensure improved genomic estimated breeding value accuracies.

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  4. [해외논문]   A parsimonious model for an analysis of parent-of-origin effects on beef traits in dual-purpose Simmental  

    Blunk, I. , Mayer, M. , Hamann, H. , Reinsch, N.
    Advances in animal biosciences v.8 suppl.1 ,pp. s76 - s78 , 2017 , 2040-4700 ,

    초록

    Genomic imprinting is a term applied to an epigenetic phenomenon where alleles are fully or partially inactivated depending on their parental origin. The relevance of this kind of parent-of-origin effects (POEs) for agriculturally important traits is widely known. A model (imprinting model) with a transmitting ability (TA) as sire and a TA as dam has been proposed that provides an estimate of the imprinting variance, whether the allelic inactivation is maternal, paternal, full or partial. Although the model can be used in a reduced version, large data sets still prevent the imprinting variance from being estimated. To further reduce the size of the equation system, we developed a parsimonious imprinting model with genetic effects for male ancestors only, as the TA as dam is replaced by her father's TA. This parsimonious model was applied to 1 366 160 Simmental fattening bulls with slaughter data available on killing out percentage, net BW gain, EUROP class and fat score in a linear and generalised linear version. The pedigrees contained up to 2 637 761 ancestors. Proportion of the total genetic variance attributed to POEs ranged between 8.6% and 17.0%. On average, the maternal gamete accounted for the greater proportion of the imprinting variance. An equivalent version of the parsimonious model facilitated the estimation of POEs with reliabilities ranging between zero and 0.97.

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  5. [해외논문]   Comparison of methods to evaluate the chemical composition of carcass from beef cattle  

    Al-Jammas, M. , Agabriel, J. , Vernet, J. , Ortigues-Marty, I.
    Advances in animal biosciences v.8 suppl.1 ,pp. s22 - s27 , 2017 , 2040-4700 ,

    초록

    In cattle, the chemical composition of the carcass is usually evaluated from one of three reference methods (rib dissection, specific gravity or a combination of easily obtained measures) or is estimated from proxy traits (USDA yield grade (YG), subcutaneous fat thickness (SFT)). Objectives were to evaluate if the relationships between the chemical composition of the carcass and each of the proxy traits (YG, SFT) differed depending on the reference method. The study was conducted by meta-analysis from published results using 25 publications that reported carcass composition and proxy traits (53%, 31% and 16% of the data were based on rib dissection, specific gravity and combination of easily obtained measures, respectively). Results showed that the amounts of carcass fat or protein that can be predicted from a given proxy trait (YG or SFT) differ significantly with the reference method used to determine carcass fat or protein.

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  6. [해외논문]   Willingness to pay for beef is highly transferrable between different consumer groups  

    Bonny, S. P. F. , Hocquette, J.-F. , Pethick, D. W. , Legrand, I. , Wierzbicki, J. , Allen, P. , Farmer, L. J. , Polkinghorne, R. J. , Gardner, G. E.
    Advances in animal biosciences v.8 suppl.1 ,pp. s72 - s75 , 2017 , 2040-4700 ,

    초록

    Accurately quantifying a consumer's willingness to pay (WTP) for beef of different eating qualities is intrinsically linked to the development of eating-quality-based meat grading systems, and therefore the delivery of consistent, quality beef to the consumer. Following Australian MSA (Meat Standards Australia) testing protocols, over 19 000 consumers from Northern Ireland, Poland, Ireland, France and Australia were asked to detail their willingness to pay for beef from one of four categories that best described the sample; unsatisfactory, good-every-day, better-than-every-day or premium quality. These figures were subsequently converted to a proportion relative to the good-every-day category (P-WTP) to allow comparison between different currencies and time periods. Consumers also answered a short demographic questionnaire. Consumer P-WTP was found to be remarkably consistent between different demographic groups. After quality grade, by far the greatest influence on P-WTP was country of origin. This difference was unable to be explained by the other demographic factors examined in this study, such as occupation, gender, frequency of consumption and the importance of beef in the diet. Therefore, we can conclude that the P-WTP for beef is highly transferrable between different consumer groups, but not countries.

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  7. [해외논문]   Evaluation of production efficiencies among primiparous suckler cows of diverse genetic index at pasture  

    McCabe, S. , McHugh, N. , Prendiville, R.
    Advances in animal biosciences v.8 suppl.1 ,pp. s55 - s59 , 2017 , 2040-4700 ,

    초록

    This study aimed to determine estimates of production efficiency among primiparous suckler cows of diverse genetic merit (GM) for the national Irish maternal index. Data from 82 heifers of diverse GM across two different replacement strategies (suckler (S) or dairy (D) sourced) were available. Milk yield, grass dry matter intake, cow BW and body condition score (BCS) were recorded. The maternal index had no significant effect on any parameters investigated, whereas S cows were 86 kg heavier in BW, had a 0.33 greater BCS and 0.6 UFL greater NEM requirement compared with D beef crossbred (F1) cows. The F1 produced 2.2 kg/day more milk and had greater lactation energy requirements (0.8 UFL) than S. The F1 produced 0.48 kg milk per 100 kg BW and 0.15 kg more milk per unit intake. An interaction between GM and cow origin (CO) showed that F1 low merit cows consumed an additional 1 kg DM than F1 high, and that S high merit cows produced 1.5 kg less milk than their S low counterparts resulting in a 0.5 UFL greater energy requirement for milk production for S low. The F1 high merit cows produced 0.12 kg more milk per unit intake than F1 low cows, whereas S low cows produced 0.12 kg less milk per unit intake than S high. The F1 low cows consumed 0.17 kg more DM per unit BW than F1 high. Thus, genetic selection for maternal traits has not resulted in differences in production efficiency traits, however CO differences were observed.

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  8. [해외논문]   Performance of Hereford bulls offered diets based on whole crop silages with or without protein inclusion  

    Pesonen, M. , Joki-Tokola, E. , Huuskonen, A.
    Advances in animal biosciences v.8 suppl.1 ,pp. s10 - s14 , 2017 , 2040-4700 ,

    초록

    An experiment with 30 Hereford growing bulls was designed to study the effects of (1) forage type and (2) inclusion of rapeseed meal (RSM) in the barley-based concentrate. The three forage types were grass silage (GS), whole crop barley silage harvested at the milk stage (BSM) or at the dough stage (BSD). The concentrate used was rolled barley alone or barley plus RSM. Mean total dry matter (DM) intakes for the GS, BSM and BSD bulls were 9.04, 8.74 and 9.46 kg/day, and carcass gains were 883, 770 and 867 g/day, respectively. Both DM intake and carcass gain were significantly higher in the BSD bulls compared with the BSM bulls. Mean carcass weights of the GS, BSM and BSD bulls were 395, 369 and 392 kg, respectively, and tended to be lower in the BSM bulls. Forage type and RSM had no effects on the carcass conformation or fat score. Rapeseed meal supplementation increased total DM intake (+10%, P P P

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  9. [해외논문]   Effect of carcass weight/age on the compositional and sensory qualities of bull beef  

    Mezgebo, G. B. , Monahan, F. J. , McGee, M. , O'Riordan, E. G. , Richardson, I. R. , Moloney, A. P.
    Advances in animal biosciences v.8 suppl.1 ,pp. s6 - s9 , 2017 , 2040-4700 ,

    초록

    This study aimed to compare the quality of beef from suckler bulls raised on a high-energy concentrate ration and slaughtered at different carcass weights (CW)/ages. In total, 42 spring-born, Charolais and Limousin-sired, weaned suckler bulls were provided with a finishing diet of ad libitum concentrates and grass silage until they reached target CW of 340, 380 and 420 kg. Intramuscular fat (IMF) content tended ( P P P P

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  10. [해외논문]   The effects of breed, month of parturition and sex of progeny on beef cow fertility using calving interval as a measure  

    Titterington, F. M. , Lively, F. O. , Dawson, S. , Gordon, A. W. , Morrison, S. J.
    Advances in animal biosciences v.8 suppl.1 ,pp. s67 - s71 , 2017 , 2040-4700 ,

    초록

    This study aimed to evaluate levels of beef cow fertility using calving interval (CI; measured in days) as a measure, and investigate the effects of breed, season, year and progeny gender on CI. The CI data included 273 764 records collected between 1997 and 2012 and included the seven most common breeds (and their crosses) in Northern Ireland (Charolais, Limousin, Belgian Blue, Simmental, Blonde d'Aquitaine, Aberdeen Angus and Hereford), accounting for 94.1% of beef dams recorded. Mean CI for all cows was 395 days, 30 days longer than the optimum 365 days. Charolais and Belgian Blue dams had the longest CI ( P P P P

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