Evidence of residual feed intake reranking in crossbred replacement heifers

Durunna, Obioha N; Colazo, M.G.; Ambrose, D.J.; McCartney, D. H.; Baron, Vern S.; Basarab, J. A.

doi:10.2527/jas.2011-4264

Cited by 43 publications

(56 citation statements)

References 16 publications

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“…This fact has also been reported in recent studies demonstrating that RFI is independent of ADG in cattle (Fitzsimons et al, 2013;Durunna et al, 2012;Lawrence et al, 2012;Cruz et al, 2010). The ADG of animals classified as low-and high-RFI (0.754 vs 0.744 kg/d, P = 0.810) during the RFI growth test was moderate and is consistent with that observed for weaned Nellore animals fed Brachiaria brizantha hay-based diet and concentrate.…”

Section: Discussionsupporting

confidence: 90%

“…Residual feed intake (RFI) is an attractive measure of feed efficiency, as it does not depend on body size, growth rate, or body composition measures (Durunna et al, 2012). High-efficiency animals exhibit low RFI and consume less feed than expected for maintenance and production, whereas low-efficiency animals have high RFI and observed feed intake higher than the predicted feed intake.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between residual feed intake and enteric methane emission in Nellore cattle

et al. 2015

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-Feed intake and average daily gain (ADG) in Nellore cattle were determined to calculate residual feed intake in two performance tests: first during the growth phase (RFI growth ) and then during a measurement of the methane emission phase (RFI met ). During the RFI growth test, 62 males and 56 females were classified as low-, medium-, and high-RFI. Enteric methane emission was measured in 46 animals; 23 males used for RFI met measurement plus 23 females (22 low-RFI growth and 24 high-RFI growth ). Diet consisted of Brachiaria brizantha cv. Marandu hay (445 g/kg DM) and concentrate (555 g/kg DM). During the RFI growth and RFI met phases, DMI was lower in the animals with low RFI, with no difference in ADG. Residual feed intake was −0.359 and 0.367 kg DM/d for low-and high-RFI animals. Enteric methane emission (g/d, g/kg BW 0.75 and g/kg ADG) did not differ between RFI growth classes. Enteric methane emission (g/d) was higher in high RFI met and lower in low RFI met males. Spearman correlations among traits obtained during both tests, which were high between metabolic BW (r = 0.959) and between DMI (r = 0.718), and zero between ADG (r = −0.062), resulted in moderate correlation between RFI growth and RFI met (r = 0.412). However, it is not possible to confirm that high-efficiency animals release less enteric methane, since different results were obtained when enteric methane was compared between the RFI growth and RFI met classes.

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Section: Discussionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Relationship between residual feed intake and enteric methane emission in Nellore cattle

et al. 2015

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“…The advantages of cattle with improved feed efficiency are numerous and are of particular importance in the cow herd owing to the expected high longevity of beef cows. RFI determinations are subject to population variability, size and type of diet; these factors make RFI an unsuitable trait for direct comparisons with other studies; however, it is important to note other impactful studies that have worked with this trait in beef heifers: Kelly et al (2010a); Durunna et al (2012);and Hafla et al (2013).…”

Section: Discussionmentioning

confidence: 99%

The relationship between feed efficiency and the circadian profile of blood plasma analytes measured in beef heifers at different physiological stages

Gonano

Montanholi

Schenkel

et al. 2014

Animal

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The characterization of blood metabolite concentrations over the circadian period and across physiological stages is important for understanding the biological basis of feed efficiency, and may culminate in indirect methods for assessing feed efficiency. Hematological analyses for albumin, urea, creatine kinase, glutamate dehydrogenase, aspartate aminotransferase, carbon dioxide, and acetate were carried out in growing and gestating heifers. These measures were carried out in a sample of 36 Bos taurus crossed beef heifers held under the same husbandry conditions. Hourly blood samples were collected over a 24-h period on three separate sampling occasions, corresponding approximately to the yearling (and open), early-gestation and late-gestation stages. This design was used to determine variation throughout the day, effects due to physiological status and any associations with feed efficiency, as measured by residual feed intake. Blood analyte levels varied with time of day, with the most variation occurring between 0800 and 1600 h. There were also considerable differences in analyte levels across the three physiological stages; for example, creatine kinase was higher ( P < 0.05) in open heifers, followed by early-and late-gestation heifers. Feed efficiency was also associated with analyte abundance. In more feed-efficient open heifers, there were higher activities of creatine kinase ( P < 0.05) and aspartate aminotransferase ( P < 0.05), and lower concentrations of carbon dioxide ( P < 0.05). Furthermore, in late gestation, more efficient heifers had lower urea concentrations ( P < 0.05) and lower creatine kinase levels ( P < 0.05). Over the whole experimental period, carbon dioxide concentrations were numerically lower in more feed efficient heifers ( P = 0.079). Differences were also observed across physiological stages. For instance, open heifers had increased levels ( P < 0.05) of creatine kinase, aspartate aminotransferase, carbon dioxide than early and late pregnancy heifers. In essence, this study revealed relevant information about the metabolic profile in the context of feed efficiency and physiological stages. Further optimization of our approach, along with the evaluation of complementary analytes, will aid in the development of robust, indirect assessments of feed efficiency.

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“…Pinheiro et al (2011) found higher repeatability of longissimus muscle area (0.70) than rump fat thickness (0.48) for measures obtained from 10 to 26 months of age of Nellore cattle. Durunna et al (2012) observed that heifers maintained the feeding behavior ranking from the first to the second test, although ranking of the animals for RFI had been altered by more than one standard deviation, suggesting high consistency and good repeatability of feeding behavior traits over time.…”

Section: Discussionmentioning

confidence: 94%

Phenotypic association between feed efficiency and feeding behavior, growth and carcass traits in Senepol cattle

Guimarães¹,

Mercadante²,

Canesin³

et al. 2017

R. Bras. Zootec.

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-The objective of this study was to evaluate the associations between feed efficiency and feeding behavior, growth and carcass traits in Senepol cattle. A total of 137 animals were evaluated. Of these animals, 36 males were evaluated in a second test, totaling 173 records (initial age of 466±96 days and initial weight of 426±104 kg). Residual feed intake (RFI) was calculated as the difference between observed and expected dry matter intake, estimated by regression of dry matter intake on average daily gain and metabolic body weight (BW 0.75 ), and the animals were classified as negative (high efficiency) and positive RFI (low efficiency). The mean RFI was -0.838±0.078 and 0.797±0.075 kg DM day -1 for negative and positive RFI animals, respectively, with a difference of 1.63 kg dry matter day -1 . The dry matter intake of negative RFI animals, expressed as kg day -1 and percentage of mean body weight, was 11.3% and 13.1% lower than that of positive RFI animals. Negative RFI animals spent less time at the feed bunk and ingested less dry matter per visit than positive RFI animals, but did not differ in terms of chest girth, scrotal circumference, or hip height. However, negative RFI animals had lower rump fat deposition (7.13±0.477 mm) than positive RFI animals (7.83±0.473 mm). The Spearman correlation between RFI estimated in the first and second tests was 0.69, indicating that RFI is consistent when evaluated during two different periods of the life of the animal. Senepol animals with low residual feed intake (high efficiency) deposit less subcutaneous rump fat, but this reduction is not accompanied by a reduction in backfat thickness and longissimus muscle area.

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Evidence of residual feed intake reranking in crossbred replacement heifers

Cited by 43 publications

References 16 publications

Relationship between residual feed intake and enteric methane emission in Nellore cattle

Relationship between residual feed intake and enteric methane emission in Nellore cattle

The relationship between feed efficiency and the circadian profile of blood plasma analytes measured in beef heifers at different physiological stages

Phenotypic association between feed efficiency and feeding behavior, growth and carcass traits in Senepol cattle

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