Feed efficiency and carcass traits of feedlot lambs supplemented either monensin or increasing doses of copaiba (Copaifera spp.) essential oil

One hundred and three lambs were fed three isonitrogenous diets: formaldehyde-treated barley (0.11% wt wt−1) with canola meal; untreated barley with corn distillers' grain and fishmeal (escape protein); and untreated barley with canola meal (control). Formaldehyde treatment did not affect ADG, whereas escape protein increased (P < 0.05) ADG of lambs by 5.3%. Carcass traits of lambs from all diets were similar, although kidney fat was reduced (P < 0.05) in lambs fed formaldehyde-treated barley. A digestibility trial with six lambs (32.6 ± 2.4 kg) showed that DM intake and digestion of DM, organic matter, nitrogen and starch were similar among diets. DE was 3.8% lower (P < 0.05) for the formaldehyde-treated diet than the mean of the other two diets. ME was 5.4% lower (P < 0.07) for the formaldehyde-treated barley than for the control diet. Digestion of NDF was 7.3% higher (P < 0.07) in the escape protein diet compared with the control diet. Treatment of barley with 0.11% (wt wt−1) formaldehyde lowered the DE of barley and did not increase the growth rate or improve the feed efficiency of feedlot lambs. Key words: Sheep, escape protein, fishmeal, formaldehyde, barley

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The Biological Activity of Monarda didyma L. Essential Oil and Its Effect as a Diet Supplement in Mice and Broiler Chicken

Molecules ◽

10.3390/molecules26113368 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3368

Author(s):

Héloïse Côté ◽

André Pichette ◽

Alexis St-Gelais ◽

Jean Legault

Keyword(s):

Body Weight ◽

Essential Oil ◽

Feed Efficiency ◽

Body Weight Gain ◽

Antibacterial Properties ◽

Resistant Bacteria ◽

Growth Promoters ◽

Antibiotic Growth Promoters ◽

Monarda Didyma

The use of growth-promoting antibiotics in livestock faces increasing scrutiny and opposition due to concerns about the increased occurrence of antibiotic-resistant bacteria. Alternative solutions are being sought, and plants of Lamiaceae may provide an alternative to synthetic antibiotics in animal nutrition. In this study, we extracted essential oil from Monarda didyma, a member of the Lamiaceae family. We examined the chemical composition of the essential oil and then evaluated the antibacterial, antioxidant, and anti-inflammatory activities of M. didyma essential oil and its main compounds in vitro. We then evaluated the effectiveness of M. didyma essential oil in regard to growth performance, feed efficiency, and mortality in both mice and broilers. Carvacrol (49.03%) was the dominant compound in the essential oil extracts. M. didyma essential oil demonstrated antibacterial properties against Escherichia coli (MIC = 87 µg·mL−1), Staphylococcus aureus (MIC = 47 µg·mL−1), and Clostridium perfringens (MIC = 35 µg·mL−1). Supplementing the diet of mice with essential oil at a concentration of 0.1% significantly increased body weight (+5.4%) and feed efficiency (+18.85%). In broilers, M. didyma essential oil significantly improved body weight gain (2.64%). Our results suggest that adding M. didyma essential oil to the diet of broilers offers a potential substitute for antibiotic growth promoters.

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275 Phenotypic relationships between heart score and feed efficiency, carcass, and pulmonary arterial pressure traits

Journal of Animal Science ◽

10.1093/jas/skaa278.377 ◽

2020 ◽

Vol 98 (Supplement_4) ◽

pp. 204-205

Author(s):

Kathryn R Heffernan ◽

Scott Speidel ◽

Milt Thomas ◽

Mark Enns ◽

Tim Holt

Keyword(s):

Arterial Pressure ◽

Feed Efficiency ◽

Pulmonary Arterial Pressure ◽

Carcass Traits ◽

Multiple Linear Regression Model ◽

Strong Relationship ◽

Fixed Effect ◽

Heart Score ◽

Important Relationship ◽

Pulmonary Arterial

Abstract Pulmonary hypertension (PH) can lead to premature mortality in fed cattle and is often called Feedlot Heart Disease (FHD). To date, pulmonary arterial pressure (PAP) has been the only indicator trait of PH that has been evaluated. The objective of this study was to evaluate relationships between heart score (using heart score as a phenotype for PH) and PAP, carcass, and feed efficiency traits in fattening Angus steers. Our hypothesis was that feed efficiency and carcass traits, along with PAP, would demonstrate a strong relationship with heart score. Feed efficiency, carcass, PAP and heart score data from 89 Black Angus steers from Colorado State University Beef Improvement Center were collected and used for this study. Evaluations were performed using a multiple linear regression model, which included heart score as a categorical fixed effect and age as a continuous fixed effect. Least Square Means, pairwise comparisons, and ANOVA tables were constructed per trait. PAP (P < 0.001) showed an important relationship to heart score and average dry matter (P < 0.10) intake approached importance to heart score. In general, feed efficiency and carcass traits decreased as heart score increased, but PAP was the only trait with a strong relationship to heart score (P < 0.05). This led us to reject our hypothesis.

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Effects of lasalocid and protein levels on feed intake and growth rate of Awassi lambs

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200596288 ◽

1997 ◽

Vol 1997 ◽

pp. 187-187

Author(s):

M. M. Muwalla ◽

M. Y. Harb ◽

T. F. Crosby

Keyword(s):

Growth Rate ◽

Feed Intake ◽

Feed Efficiency ◽

Published Data ◽

Growth Promoter ◽

Feed Conversion ◽

Protein Levels ◽

Feedlot Lambs ◽

Lamb Growth ◽

Awassi Lambs

Lasalocid is a polyether antibiotic derived from the fermentation of streptomyces lasaliensis used as a coccidiostat in sheep. There are varying literature reports on lamb growth rate and feed intake when lasalocid is included in the diet of feedlot lambs. While some reports have shown that lasalocid enhances feed efficiency in ruminants by decreasing feed intake and either maintaining or improving rate of gain others indicate that lasalocid did not have any effect on lamb growth rates or feed efficiency (Stobart et al., 1987). Also, when lasalocid was fed to Chios lambs, growth rate was increased but there was no improvement in feed conversion efficiency (Hadjipanayiotou et al., 1988). There are no published data in the literature relating to the use of lasalocid as a growth promoter in the Awassi breed of sheep fed complete diets and the purpose of this study was to investigate the effect of lasalocid with two levels of protein on the growth rate and feed efficiency of weaned male and female Awassi lambs.

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666 Effect of oregano essential oil and black wattle tanniniferous extract in the diet of feedlot lambs on meat fatty acid composition

Journal of Animal Science ◽

10.2527/asasann.2017.666 ◽

2017 ◽

Vol 95 (suppl_4) ◽

pp. 326-326

Author(s):

K. C. Welter ◽

C. M. de Magalhães Rodrigues Martins ◽

F. A. Melo ◽

G. Benetel ◽

C. M. D. Silva ◽

...

Keyword(s):

Fatty Acid Composition ◽

Fatty Acid ◽

Essential Oil ◽

Acid Composition ◽

Oregano Essential Oil ◽

Black Wattle ◽

Feedlot Lambs

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Effects of dietary tannin source on performance, feed efficiency, ruminal fermentation, and carcass and non-carcass traits in steers fed a high-grain diet

Animal Feed Science and Technology ◽

10.1016/j.anifeedsci.2010.05.003 ◽

2010 ◽

Vol 159 (1-2) ◽

pp. 1-9 ◽

Cited By ~ 62

Author(s):

W.K. Krueger ◽

H. Gutierrez-Bañuelos ◽

G.E. Carstens ◽

B.R. Min ◽

W.E. Pinchak ◽

...

Keyword(s):

Feed Efficiency ◽

Carcass Traits ◽

Ruminal Fermentation

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Genetic and phenotypic associations of feed efficiency with growth and carcass traits in Australian Angus cattle1

Journal of Animal Science ◽

10.1093/jas/sky325 ◽

2018 ◽

Vol 96 (11) ◽

pp. 4521-4531 ◽

Cited By ~ 4

Author(s):

José Antonio Torres-Vázquez ◽

Julius H J van der Werf ◽

Samuel A Clark

Keyword(s):

Feed Efficiency ◽

Carcass Traits

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The effect of slaughter weight on growth and carcass traits of Holstein-Friesian bulls offered a cereal-based diet

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200008127 ◽

2002 ◽

Vol 2002 ◽

pp. 156-156

Author(s):

R.M. Kirkland ◽

R.W.J. Steen ◽

D.C. Patterson

Keyword(s):

Feed Efficiency ◽

Carcass Traits ◽

Minimum Cost ◽

Beef Industry ◽

Slaughter Weight ◽

Bull Calves ◽

Holstein Friesian ◽

Beef Producers ◽

Ready Availability ◽

Production Characteristics

With the current situation of low profitability in the beef industry, producers must aim to produce beef efficiently and at minimum cost. In view of the ready availability of Holstein Friesian bull calves as a by-product of the dairy industry, the rearing and finishing of these animals offers a possible source of income to beef producers. The objective of the present study was to examine the influence of slaughter weight on feed efficiency and production characteristics of Holstein-Friesian bulls offered a cereal-based diet.

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