Growth, feed conversion efficiency and carcass composition of Arabian fat-tailed lambs fed diets with different proportions of a cardboard-based protein-enriched fermented feed

The aim of the present study was to investigate the effects of induction hypothyroidism by propylthiouracil (PTU) on the growth performance and meat quality of fat-tailed Lori-Bakhtiari lambs. Eighteen Lori-Bakhtiari male lambs were randomly assigned to one of three groups (n = 6) and received daily treatments (gavage) consisting of 0 (Control: C), 10 (Low: L) or 20 (High: H) mg PTU/kg bodyweight/day for 60 days. PTU decreased plasma triiodothyronine and thyroxine concentration in both L and H (P < 0.0001). Lambs treated with PTU (L and H) had lower feed intake (P < 0.004), feed conversion efficiency (P < 0.003), and greater intramuscular fat than C lambs (P < 0.035). Meat from the L and H lambs had lower cooking loss and shear force, and also higher L* (lightness) than C lambs (P < 0.004, P < 0.015 and P < 0.025, respectively). The meat of H and L lambs was more tender than C lambs (P < 0.032). However, the meat of H lambs required fewer chews before swallowing than C lambs (P < 0.041). Generally, induction of mild hypothyroidism appeared to improve feed conversion efficiency and meat quality of lambs.

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Some effects of dietary penicillin and zinc bacitracin on the performance of bacon pigs

Animal Science ◽

10.1017/s0003356100021772 ◽

1963 ◽

Vol 5 (3) ◽

pp. 251-257 ◽

Cited By ~ 3

Author(s):

D. W. Holme ◽

K. L. Robinson

Keyword(s):

Conversion Efficiency ◽

Control Diet ◽

Live Weight ◽

Experimental Period ◽

Carcass Composition ◽

Significant Response ◽

Feed Conversion ◽

Feed Conversion Efficiency ◽

Pig Performance ◽

Zinc Bacitracin

SUMMARYThree experiments were carried out to evaluate zinc bacitracin as compared with penicillin, as a feed supplement for bacon pigs. The first experiment compared pig performance on a control diet with performance on the control diet supplemented with penicillin, 5 g./ton, or with zinc bacitracin, 10 g./ton. Experiment 2 compared the control diet with penicillin at 10 g./ton and zinc bacitracin at 10 g./ton with pigs housed in a different piggery. Experiment 3 compared the control diet with penicillin at 10 g./ton and zinc bacitracin at two levels, 10 g./ton and 5 g./ton. In none of the experiments was there any significant response to penicillin in terms of rate of gain, feed conversion efficiency or carcass composition. In the first experiment there was a small but significant improvement in rate of gain up to 100 lb. live-weight and for the whole experimental period by the pigs receiving 10 g./ton of zinc bacitracin. There was no significant response in feed conversion efficiency or carcass measurements. In the other two experiments there was no response to zinc bacitracin. The implications of the results are discussed.

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Infertile bulls versus steers: II. Feed conversion efficiency and the effects of a high fat diet

The Journal of Agricultural Science ◽

10.1017/s0021859600024461 ◽

1971 ◽

Vol 77 (2) ◽

pp. 313-315 ◽

Cited By ~ 4

Author(s):

M. A. Price ◽

N. T. M. Yeates

Keyword(s):

Conversion Efficiency ◽

Dietary Fat ◽

Beef Tallow ◽

High Fat Diet ◽

Carcass Composition ◽

Feed Conversion ◽

High Fat ◽

Feed Conversion Efficiency

SummaryThe feed conversion efficiency of four intensively fed, partially castrated male cattle, measured over an 11-week period from approximately 9-months of age, was found to be significantly higher (P <0·05) than that of four steers.The effect of adding 5% beef tallow to the diet during this period was also studied. Although no statistically significant result of this on feed conversion was obtained, there was an indication that fat in the diet improved the bulls' efficiency, but not that of the steers. Added dietary fat had an effect on carcass composition, increasing signifioantly (P < 0·05) the deposition of carcass fat by steers but having no such effect in bulls. It appears, therefore, that the two sex types metabolized the added dietary fat differently, the steers converting much of it to depot fat; the bulls using it (with some evidenoe of greater efficiency) for growth of non-adipose carcass components.

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EFFECT OF ALTERING THE SOURCE OF NONESSENTIAL NITROGEN ON PERFORMANCE AND CARCASS COMPOSITION OF THE BROILER CHICK

Canadian Journal of Animal Science ◽

10.4141/cjas86-120 ◽

1986 ◽

Vol 66 (4) ◽

pp. 1097-1105

Author(s):

M. R. BEDFORD ◽

J. D. SUMMERS

Keyword(s):

Amino Acids ◽

Weight Gain ◽

Conversion Efficiency ◽

Energy Levels ◽

Essential Amino Acids ◽

Carcass Composition ◽

Metabolizable Energy ◽

Feed Conversion ◽

Feed Conversion Efficiency ◽

Excess Nitrogen

Male broilers were fed diets containing 14, 18 or 22% crude protein (CP) and 10.88, 12.13 or 13.39 MJ kg−1 metabolizable energy (ME) to 3 wk of age. For each level of CP and ME, three diets were formulated so that excess nitrogen arose mainly from nonessential amino acids (NEAA), essential amino acids (EAA) or both. The source of nitrogen excess had no effect on any of the parameters measured in birds fed the 18 and 22% CP diets. However, at 14% CP and over all energy levels, excess nitrogen in the form of EAA gave rise to superior results with regard to weight gain, feed conversion efficiency and carcass protein when compared to those diets where the excess nitrogen arose mainly from NEAA sources. Increasing dietary energy reduced the effect that source of nonessential nitrogen had on weight gain, feed conversion efficiency and carcass protein deposition at 14% CP. Key words: Amino acids, energy, protein, broilers

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Evolution in Configuration and Productivity of New Zealand Hill Country Sheep and Beef Cattle Systems

Agriculture ◽

10.3390/agriculture11060531 ◽

2021 ◽

Vol 11 (6) ◽

pp. 531

Author(s):

Januarius Gobilik ◽

Stephen Todd Morris ◽

Cory Matthew

Keyword(s):

New Zealand ◽

Beef Cattle ◽

Conversion Efficiency ◽

Production Systems ◽

Metabolic Energy ◽

Meat Production ◽

Feed Conversion ◽

Feed Conversion Efficiency ◽

Hill Country ◽

Cattle Systems

Metabolic energy budgeting (MEB) was used to evaluate evolution over 30 years (1980–1981 to 2010–2011) in New Zealand southern North Island ‘hill country’ sheep and beef cattle systems. MEB calculates energy required by animals for body weight maintenance, weight gain or loss, pregnancy, and lactation to estimate the system feed demand and thereby provide a basis for calculating feed conversion efficiency. Historic production systems were reconstructed and modeled using averaged data from industry surveys and data from owners’ diaries of three case-study farms and reviewed for patterns of change over time. The modeling indicated that pasture productivity was 11% lower and herbage harvested was 14% lower in 2010–2011 than in the early 1980s. This productivity decline is attributable to warmer, drier summer weather in recent years. However, primarily through increased lambing percentage, feed conversion efficiency based on industry data improved over the study period from 25 to 19 kg feed consumed per kg lamb weaned, while meat production rose from 137 to 147 kg per ha per year. Similar improvements were observed for the three case farms. The New Zealand MEB model was found effective for analysis of tropical beef production systems in Sabah, Malaysia.

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Erratum to “Genetic variation for growth rate, feed conversion efficiency, and disease resistance exists within a farmed population of rainbow trout” [Aquaculture 209 (2002) 59–76]

Aquaculture ◽

10.1016/s0044-8486(02)00492-1 ◽

2003 ◽

Vol 216 (1-4) ◽

pp. 387-388 ◽

Cited By ~ 1

Author(s):

Mark Henryon ◽

Alfred Jokumsen ◽

Peer Berg ◽

Ivar Lund ◽

Per B Pedersen ◽

...

Keyword(s):

Growth Rate ◽

Genetic Variation ◽

Disease Resistance ◽

Rainbow Trout ◽

Conversion Efficiency ◽

Feed Conversion ◽

Feed Conversion Efficiency

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Heterozygous depletion of pik3r1 improves growth and feed conversion efficiency in Gibel carp (Carassius gibelio)

Aquaculture ◽

10.1016/j.aquaculture.2021.737207 ◽

2021 ◽

pp. 737207

Author(s):

Jianfei Huang ◽

Chuang Shi ◽

Yanping Gao ◽

Jingzhi Su ◽

Yuqin Shu ◽

...

Keyword(s):

Conversion Efficiency ◽

Gibel Carp ◽

Feed Conversion ◽

Feed Conversion Efficiency ◽

Carassius Gibelio

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Effect of forage to concentrate ratio and duration of feeding on growth and feed conversion efficiency of male lambs

Translational Animal Science ◽

10.1093/tas/txy071 ◽

2018 ◽

Vol 2 (4) ◽

pp. 419-427 ◽

Cited By ~ 2

Author(s):

Noel A Claffey ◽

Alan G Fahey ◽

Vasiliki Gkarane ◽

Aidan P Moloney ◽

Frank J Monahan ◽

...

Keyword(s):

Conversion Efficiency ◽

Carcass Weight ◽

Feed Conversion ◽

Fresh Weight ◽

Viable Option ◽

Financial Return ◽

Feed Conversion Efficiency ◽

Ad Libitum ◽

The Cost ◽

Concentrate Inclusion

Abstract Rations (DM basis) for spring-born male lambs consisting of concentrates ad libitum (CON), 50:50 (50% concentrate:50% forage), and forage ad libitum (FORG) were evaluated across feeding periods of three durations (36, 54, and 72 d). Lambs on CON diets were offered ad libitum access to concentrate along with 400 g of fresh weight silage (daily), while 50:50 diets were offered 0.9 and 3.0 kg of concentrate and silage, respectively. Lambs on FORG were offered ad libitum access to 25.5% DM silage. These rations were fed to 99 spring-born male Texel cross Scottish Blackface lambs which were assigned to a 3 × 3 factorial arrangement. Lambs were slaughtered following completion of their respective treatments. Lambs fed CON diets had greater ADG, FCE, and carcass weight (P < 0.001) and carcasses with greater conformation score (P < 0.001) than lambs fed 50:50 or FORG diets. Duration of feeding had no effect on production variables across all three concentrate inclusion levels. It was concluded that the inclusion of concentrates is needed to adequately finish lambs fed indoors. Feeding lamb’s 50:50 diets resulted in modest responses and may be a viable option for finishing lambs or to maintain growth in lambs when the cost of concentrate feed is high relative to the financial return on the lamb meat.

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