Evaluation of Wagyu for residual feed intake: Optimizing feed efficiency, growth, and marbling in Wagyu cattle

McGee, M.; Welch, C. M.; Hall, J. B.; Small, W.; Hill, Rodney A.

doi:10.15232/s1080-7446(15)30195-9

Cited by 6 publications

(3 citation statements)

References 32 publications

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“…Fat thickness between the 12th and 13th ribs was measured by ultrasound at the conclusion of the residual feed intake (RFI) trial. Residual feed intake was calculated based on methodology previously used in our laboratory ( McGee et al, 2013 ). The final formula was RFI = DMI − [1.75 + 2.09 (ADG) + 0.081 (metabolic mid-point BW) − 0.046(rib fat thickness)].…”

Section: Methodsmentioning

confidence: 99%

Effect of a Lactobacillus fermentation product on postweaning heifer performance

Hall

Bloomsburg

Goddard

2022

Translational Animal Science

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The objective of the experiment was to compare the effect of dietary inclusion of a prebiotic fermentation product of Lactobacillus acidophilus (LaP, RumaCell; 5 mL•animal -1•d -1) or monensin on performance of replacement beef heifers. Heifers received a total mixed ration containing either LaP (n =77) or monensin (MON; Rumensin; 200 mg•animal -1•d -1; n = 79). Heifers were fed for 71 days in a GrowSafe unit so individual feed intake could be measured. Heifers were weighed every two weeks and feed efficiency calculated by residual feed intake (RFI). At the end of the RFI trial, heifers remained on their diets for an additional 27 days and were estrus synchronized using the 14-d CIDR + PG protocol and bred by artificial insemination (AI) followed by natural service. Prior to estrous synchronization reproductive tract scores (RTS; 1 = infantile to 5 = cycling/presence of corpus luteum) were measured. Continuous variables were analyzed using generalized mixed models whereas categorical data were analyzed by logistic regression. Body weights, average daily gain, feed intake and RFI value were similar (P > 0.30) among MON and LaP supplemented heifers. Across treatments heifers gained 0.9 ± 0.1 kg/d while consuming 9.3 ± 0.5 kg of diets daily. Reproductive development as indicated by RTS was similar (P > 0.28) between treatments. However, estrus response increased (P < 0.01) and AI pregnancy rates tended to be greater (P < 0.07) for MON compared to LaP heifers. In contrast, the percentage of heifers pregnant by 60 d and 100 d (80.4% and 90.5%, respectively) were not different (P > 0.33) for MON and LaP heifers. In conclusion, addition of LaP to replacement heifer diets may result in growth and reproductive performance similar to an ionophore, if dietary energy is adequate for normal heifer growth.

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Section: Methodsmentioning

confidence: 99%

Effect of a Lactobacillus fermentation product on postweaning heifer performance

Hall

Bloomsburg

Goddard

2022

Translational Animal Science

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“…One of the great advantages of RFI is that the heritability estimate varies from medium to high, indicating that selection for such trait will bring genetic progress (Ferreira et al 2012). Some international researches were carried out to identify the most efficient genotypes by measuring the residual feed intake, mainly for European bovine breeds (Liu et al 2000;Basarab et al 2003;Wang et al 2006;Moore et al 2009), and recently the Japanese Wagyu breed (Mcgee et al 2013). However, few studies have been done with zebu animals, highlighting those of Arthur et al (2005), Gomes (2009), Santana (2009) and Grion (2012), carried out in Brazil.…”

Section: Introductionmentioning

confidence: 99%

Phenotypic association between residual feed intake and carcass traits of young nelore bulls

et al. 2021

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The purpose of this study was to estimate the phenotypic associations between residual food intake (RFI) and carcass traits, evaluated by ultrasonography, of young Nellore bulls. Information about 53 young Nelore bulls, pure origin (PO), participants in the Individual Performance Test of Nelore Bulls, carried out at the Capim Branco experimental farm of the Federal University of Uberlândia (UFU) were used for this purpose. It was evaluated the characteristics of residual feed intake (RFI), rib eye area (REA), marbling (MAR) and fat thickness (FT). In order to estimate the Spearman and Pearson correlation coefficients, the SAS program was used. Regarding the influence of the RFI classes (low RFI, medium RFI and high RFI) on carcass traits, an out analysis of variance was carried out using the least squares method. It was verified that there was no phenotypic association between RFI and the characteristics of REA and MAR, but the relation between FT and the phenotypic association revealed a medium magnitude. However, when evaluating the RFI classes, it was observed that there were no significant differences of the RFI classes with the carcass traits (REA, FT and MAR). It is recommended that new studies are carried out to verify if the selection for RFI does not result in damages to the finishing of carcass in Nelore cattle.

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“…A mensuração do CAR é vantajosa e rentável para todos os sistemas de produção de carne bovina e pode ser incluída em programas de seleção, pois as estimativas de herdabilidade variam de moderada a alta (Moore et al, 2009;Mcgee et al, 2013;Gomes et al, 2012). Dessa forma, a seleção para o CAR poderá levar à produção de animais com menor consumo de alimentos, mas, de acordo com Basarab et al (2003), como consequência, poderá acarretar a seleção de animais com menor teor de gordura subcutânea.…”

Section: Introductionunclassified

Associação entre eficiência alimentar e ganho em acabamento de carcaça de bovinos da raça Nelore

Gomes

Faria

Bezerra

et al. 2019

Arq. Bras. Med. Vet. Zootec.

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4Embrapa Pecuária Sudeste ˗ São Carlos, SP RESUMO Objetivou-se estimar a associação fenotípica entre a eficiência alimentar e o ganho em acabamento de carcaça de touros jovens da raça Nelore. Utilizaram-se informações de 98 touros jovens da raça Nelore, participantes de duas provas de eficiência alimentar que empregaram o sistema de cochos eletrônicos Growsafe ® , as quais foram realizadas nos anos de 2015 e 2016, na fazenda Capim Branco, da Universidade Federal de Uberlândia. As provas de eficiência alimentar tiveram duração de 91 dias, sendo 21 dias de adaptação e 70 dias de avaliação. Os animais apresentavam idade média ao início e ao término do confinamento de 19,98 e 22,16 meses e peso inicial e final médio de 428,17 e 542,27kg, respectivamente. Verificou-se que os animais mais eficientes depositaram menos gordura, e os animais menos eficientes depositaram mais gordura durante o período de avaliação em confinamento. Observouse que há uma associação fenotípica de baixa magnitude (0,29) entre o consumo alimentar residual (CAR) e o ganho em acabamento de carcaça (GACAB). Assim, pode-se inferir que, ao serem selecionados menores valores de CAR, haverá alguma interferência negativa em GACAB. Concluiu-se que animais mais eficientes (CAR negativo) podem apresentar menor deposição de gordura subcutânea, influenciando na qualidade de carcaça de bovinos da raça Nelore. Palavras-chave: consumo alimentar residual, gordura subcutânea, bovinos de corte ABSTRACTThis study aimed to estimate the phenotypic association between feed efficiency and gain in carcass finishing of young Nelore bulls. Information from 98 young Nelore bulls participating in two feed efficiency tests using the Growsafe® electronic trough system, carried out in the years 2015 and 2016, at the Capim Branco farm of the Universidade Federal de Uberlândia was used .The feed efficiency tests lasted for 91 days, with 21 days of adaptation and 70 days of evaluation. The animals had a mean age at the beginning and end of the confinement of 19.98 and 22.16 months, and mean weight initial and end of 428.17 and 542.27kg, respectively. It was verified that most efficient animals deposited less fat, and the efficient animals deposited more fat during the evaluation period at the confinement. It was observed that there is a low magnitude phenotypic association (0.29) between the residual feed intake (RFI) and the gain in carcass finishing (GACAB). Thus, it can be inferred that by selecting lower values of residual feed intake there will be some negative interference in GACAB. It was concluded that the most efficient animals (negative RFI) may present lower deposition of subcutaneous fat, influencing the carcass quality of Nelore cattle.

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Evaluation of Wagyu for residual feed intake: Optimizing feed efficiency, growth, and marbling in Wagyu cattle

Cited by 6 publications

References 32 publications

Effect of a Lactobacillus fermentation product on postweaning heifer performance

Effect of a Lactobacillus fermentation product on postweaning heifer performance

Phenotypic association between residual feed intake and carcass traits of young nelore bulls

Associação entre eficiência alimentar e ganho em acabamento de carcaça de bovinos da raça Nelore

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