Genetic analysis of residual feed intake adjusted for fat and carcass and performance traits in a Nellore herd

Moraes, Giovanna Faria de; Abreu, Luíza Rodrigues Alves; Ferreira, Isabel Cristina; Pereira, Idalmo Garcia

doi:10.1590/0103-8478cr20151505

Cited by 17 publications

(8 citation statements)

References 14 publications

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“…The genetic correlations with CIMF and CMS, while of reduced magnitude, were not statistically different from zero on the basis of their standard errors. This is consistent with Moraes et al (2017) who redefined RFI to account for back fat thickness and observed a reduction in magnitude of the genetic correlation between RFI and back fat thickness (0.42-0.23).…”

Section: Genetic Correlationssupporting

confidence: 90%

“…While the common definition for RFI includes adjustments for maintenance of liveweight and growth rate, adjustments can also be included for other traits. Several studies have modified the definition of RFI, for example, Kelly et al (2019) who included carcass weight and carcass fat score, Basarab et al (2011) who included heifer backfat thickness and feeding frequency and Moraes et al (2017) who included bull rump fat thickness. As explained by Kelly et al (2019), the main reason for including adjustments for fat is to ensure that differences in RFI are not primarily the result of differences in body or carcass fat.…”

Section: Introductionmentioning

confidence: 99%

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Redefining residual feed intake to account for marbling fat in beef breeding programs

Duff

Werf

Parnell³

et al. 2021

Anim. Prod. Sci.

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Context. Improving meat quality traits such as marbling is a well established breeding objective for many beef producers. More recently, the inclusion of feed efficiency is being considered. The main driving factors being the direct feed cost, as well as consumer concerns related to environmental sustainability of beef production.Aims. The main aim of this study was to examine modifying the definition of residual feed intake (RFI), by including an adjustment for intramuscular fat (IMF). The secondary aim was to further understand the genetic relationships between feed intake and a range of carcass traits.Methods. Using a population of 4034 Australian Angus animals, feed intake and carcass traits, along with pedigree and fixed effects, were analysed. This included the calculation of three definitions of RFI, being the standard definition, accounting for average daily gain and metabolic mid-weight, and two amended versions accounting for ultrasound IMF (RFI u ), or carcass IMF (RFI i ). Variance components, heritabilities, and genetic and phenotypic correlations were estimated and compared.Key results. All three definitions of RFI were moderately heritable (0.30-0.32) and highly correlated, both genetically (0.99) and phenotypically (0.99). Unfavourable genetic correlations were observed between RFI and carcass IMF (CIMF), and between RFIu and CIMF at 0.29 and 0.24 respectively. Similarly, there were unfavourable genetic correlations between RFI and ultrasound IMF (UIMF), between RFIi and UIMF, and between RFIu and UIMF at 0.30, 0,21 and 0.23 respectively.Conclusions. RFI can be redefined to account for traits, other than average daily gain and metabolic mid-weight, such as IMF. However due to limitations of phenotypic linear regression, and only small amounts of variation in feed intake being explained by the IMF traits, the redefinition of RFI was a suboptimal approach to breeding candidate selection. Furthermore, the present study confirmed the challenges with selecting for both feed efficiency and meat quality traits as they are generally genetically antagonist.Implications. For beef cattle breeding programs, the investigation of alternative selection approaches is warranted. This may include further understanding the genetic correlations among traits in the breeding objective and, according to their economic value, optimally weighting the related estimated breeding value.

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Section: Genetic Correlationssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Redefining residual feed intake to account for marbling fat in beef breeding programs

Duff

Werf

Parnell³

et al. 2021

Anim. Prod. Sci.

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“…DMI, ADG, RFI and MW averaged 10.3  1.2 kg, 1.6  0.3 kg, -0.003  0.7 kg and 90.6  8.7 kg, respectively. These traits have been described manly in other zebu breeds, such as Nellore, in which DMI, ADG, RFI and MW averaged 7.59  1.46 kg, 1.03  0.25 kg, 0.00009  0.53 kg and 80.1  8.8 kg, respectively (Moraes et al, 2016). DMI and ADG are two important traits that give an idea of how each animal is taking advantage of food and turning it into body mass, i.e., feed conversion (FC = DMI/ADG).…”

Section: Resultsmentioning

confidence: 65%

“…No other previous study in Guzerat included IMF as a carcass characteristic to estimate heritability in this breed; however, comparing this trait between Guzerat and Nellore cattle, results show that heritability for IMF is higher than found in Nellore (0.24 and 0.19, respectively) (Magalhães et al, 2019). DMI, ADG and RFI have an estimated heritability of 0.37, 0.50 and 0.28 respectively for Nellore (Moraes et al, 2016;Polizel et al, 2018), higher than found in our study, where estimates were 0.10, 0.21 and 0.12, respectively.…”

Section: Resultsmentioning

confidence: 74%

Research Article Estimation of variance components for carcass and production traits in Guzerat cattle

Cancino-Baier¹,

Mamani²,

Santana³

et al. 2019

Genet. Mol. Res.

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“…The study of variations in feed efficiency unveils differences in responses of efficient and inefficient animals. Previous work has shown that efficient animals display different BW gain patterns, including reduced fat thickness during finishing, smaller visceral fat depots, and reduced non-carcass weight (Gomes et al, 2012;Redden et al, 2013;Nascimento et al, 2016;Moraes et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Residual intake and gain for the evaluation of performance, non-carcass components, and carcass characteristics of confined crossbred Texel lambs

et al. 2019

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We evaluated performance, non-carcass components, and carcass characteristics of crossbred Texel lambs in different categories of residual intake and gain (RIG). We assessed 77 crossbred (¼ Pantaneira and ¾ Texel) non-castrated animals in two study phases. The first phase included 47 lambs with an initial average weight of 29.9±5.5 kg, and the second phase included 30 lambs with initial average weight of 22.4±3.3 kg. Dry matter intake (DMI) and average daily gain (ADG) were evaluated for 70 days. Animals were divided into three groups in terms of efficiency: efficient (high RIG), intermediate (medium RIG), or inefficient (low RIG), based on the standard deviation of the mean for the RIG variable. We measured the yield of noncarcass components, carcass characteristics, and yield of meat cuts. Efficiency group had no association with DMI, nor with initial and final body weights of the animals. The ADG of efficient (0.310 kg day −1 ) and intermediate (0.290 kg day −1 ) animals was greater than observed in inefficient (0.260 kg day −1 ) animals. Lambs in the efficient and intermediate groups had significantly higher levels of all efficiency indicators evaluated. Efficient and intermediate animals yielded significantly more wool/skin in comparison with lambs in the inefficient group. Animals with high RIG also had lower relative weight of testicles/scrotal sac in comparison with inefficient animals. Fat deposition in the omentum and mesentery as well as total fat were decreased in efficient animals. No significant differences occurred among groups regarding carcass characteristics and yield of meat cuts. The RIG index allows for the identification of lambs with higher growth rates and greater wool/skin yield and lower proportion of visceral fat.

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Genetic analysis of residual feed intake adjusted for fat and carcass and performance traits in a Nellore herd

Abstract: ABSTRACT:The study of the genetic evaluation of residual feed intake adjusted for fat (RFIFat)

Cited by 17 publications

References 14 publications

Redefining residual feed intake to account for marbling fat in beef breeding programs

Redefining residual feed intake to account for marbling fat in beef breeding programs

Research Article Estimation of variance components for carcass and production traits in Guzerat cattle

Residual intake and gain for the evaluation of performance, non-carcass components, and carcass characteristics of confined crossbred Texel lambs

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