Performance and carcass composition of docked and control fat-tailed Kellakui lambs

O'Donovan, P. B.; Ghadaki, M. B.; Behesti, R. D.; Saleh, B.; Rollinson, David

doi:10.1017/s0003356100034887

Cited by 20 publications

(6 citation statements)

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“…This is in close agreement with earlier work of O'Donovan et al (1973) on Kellakui fat-tailed sheep in Iran and Alkass et al (1985) on Awassi lambs in Iraq. Similarly, results of the present experiment showed that tail docking had no effect on postweaning performance of lambs given moderate to high levels of ME ( ≥ 0·743 MJ/kg M 0·75 per day), as in earlier work by Joubert and Ueckermann (1971), O'Donovan et al (1973) and Alkass et al (1985). However, previous work with Awassi lambs by Farhan et al (1969) showed that docking decreased daily gain, dressing percentage, the percentage of fat in the carcass and carcass weight as a proportion of empty body weight.…”

Section: Food Intake and Growth Of Lambssupporting

confidence: 93%

“…Tail docking in Awassi sheep is not a common practice in sheep farming in Middle Eastern countries. However, several tail docking experiments have been carried out in an attempt to improve the growth, food conversion efficiency and carcass characteristics of lambs (Epstein, 1961;Farhan et al, 1969;O'Donovan et al, 1973;Alkass et al, 1985;Shelton et al, 1991). The fat tail plays an important rôle in adaptation in sheep raised under the harsh feeding conditions of arid and semi-arid regions, where the availability of foodstuffs, and especially of good quality roughage is seasonal.…”

Section: Introductionmentioning

confidence: 99%

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Effect of tail docking in Awassi lambs on metabolizable energy requirements and chemical composition of carcasses

et al. 2002

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The effect of tail docking on metabolizable energy requirements and carcass characteristics was studied using 80 weaned entire Awassi (between 0·74 and 1·1 MJ/ kg M 0·75 per day). Hot and cold carcass weights were similar ( P > 0·05) for the two groups. Differences in empty body weight and fleece-free empty body weight were significant ( P < 0·05) only for the 0·443 to 0·522 MJ/kg M 0·75 per day level of ME intake. Predicted ME requirements were higher for docked lambs for an estimated LWG between 0 and 100 g/day and lower for higher LWG (125 to 225 g/day). Docking had no effect ( P > 0·05) on food conversion efficiency (FCE). Carcasses from docked lambs had significantly lower ( P < 0·001) internal plus tail fat. Pooled soft tissue excluding tail fat, for the undocked lambs contained significantly more ( P < 0·01) protein, less ( P < 0·001) fat, higher ( P < 0·01) moisture and similar ( P > 0·05) ash content.

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Section: Food Intake and Growth Of Lambssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effect of tail docking in Awassi lambs on metabolizable energy requirements and chemical composition of carcasses

et al. 2002

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“…There is also some evidence of increased subcutaneous fat in docked tailed sheep over the buttocks. The research of O'Donovan et al (1973) on Turkish Tuj rams revealed that nearly 50% of fat originally deposited in the tail migrated to subcutaneous, intermuscular, and INF in docked lambs, which is consistent with the current research. Al Jassim et al (2002) also concluded that docked lambs had more fat deposition in omental, pelvic, and kidney than undocked lambs under high energy feeding levels.…”

Section: Discussionsupporting

confidence: 90%

Effects of tail docking on the expression of genes related to lipid metabolism in Lanzhou fat-tailed sheep

et al. 2016

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ABSTRACT. To evaluate stearoyl-CoA desaturase (SCD), hormonesensitive lipase (HSL), lipoprotein lipase (LPL), and peroxisome proliferator-activated receptor (PPARγ) expression in Lanzhou fat-tailed sheep (with and without docked tails), 18 rams were randomly divided into two equal groups (docked group, LT; control group, LC). These data were also used to increase the understanding of sheep fat deposition and metabolism. All animals were harvested at the age of 18 months, and expression was determined for 10 tissues. The results indicated that the fat weight of each tissue in LT was higher than in LC (P < 0.05). SCD expression in semitendinosus, omentum majus fat (OF), subcutaneous fat, kidney fat (KF), and subcutaneous rump fat was higher in LT than in LC rams (P < 0.05). Trends (P < 0.10) associated with higher HSL expression of LC in comparison to that of LT rams in intestinal fat, OF, and KF tissues were detected. Numerically, LPL expression was the highest in KF, OF, and kidney tissues, but there were few differences (P > 0.10). PPARγ expression was greater in LT than in LC rams in liver tissues (P < 0.05), but there were few differences in other tissues. No significant differences were found with regard to the regression analysis of expression and adipose tissue weights, but the two indices exhibited the same trend. The results indicated that changes in fatty deposits may be due to the common control of docking management and the minor effects associated with the regulation of SCD, HSL, LPL, and PPARγ expression.

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“…When WAT is surgically removed, the remaining unexcised WAT pads increase their mass in what appears to be an attempt to compensate for the lipectomy-induced lipid loss. Compensatory responses have been seen in laboratory mice (202,203) and rats (204)(205)(206)(207)(208), lambs (209), ground squirrels (210,211), and Syrian (212,213) and Siberian (19,108,(214)(215)(216)(217)(218) hamsters, and suggestive evidence has been seen in humans (219,220). The signal for this robust lipectomy-induced compensatory increase in WAT masses is unknown, but it could involve the disruption of WAT sensory innervation that accompanies lipectomy.…”

Section: Wat Has Sensory Innervation the Function Of Which Remains Tmentioning

confidence: 99%

Thematic review series: Adipocyte Biology. Sympathetic and sensory innervation of white adipose tissue

Bartness

Song

2007

Journal of Lipid Research

182

142

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During our study of the reversal of seasonal obesity in Siberian hamsters, we found an interaction between receptors for the pineal hormone melatonin and the sympathetic nervous system (SNS) outflow from brain to white adipose tissue (WAT). This ultimately led us and others to conclude that the SNS innervation of WAT is the primary initiator of lipid mobilization in these as well as other animals, including humans. There is strong neurochemical (norepinephrine turnover), neuroanatomical (viral tract tracing), and functional (sympathetic denervation-induced blockade of lipolysis) evidence for the role of the SNS in lipid mobilization. Recent findings suggest the presence of WAT sensory innervation based on strong neuroanatomical (viral tract tracing, immunohistochemical markers of sensory nerves) and suggestive functional (capsaicin sensory denervation-induced WAT growth) evidence, the latter implying a role in conveying adiposity information to the brain. By contrast, parasympathetic nervous system innervation of WAT is characterized by largely negative neuroanatomical evidence (viral tract tracing, immunohistochemical and biochemical markers of parasympathetic nerves). Functional evidence (intraneural stimulation and in situ microdialysis) for the role of the SNS innervation in lipid mobilization in human WAT is convincing, with some controversy regarding the level of sympathetic nerve activity in human obesity.-Bartness, T. J., and C. K. Song. Sympathetic and sensory innervation of white adipose tissue. J. Lipid Res. 2007. 48: 1655-1672. Supplementary key words obesityObesity is a disease of literally and figuratively enormous proportions (1, 2) and is an independent risk factor for type II diabetes, cardiovascular disease, stroke, and some cancers (3-5). Estimates of the mortality rate of overweight/obese individuals range from ?325,000 deaths per year (6) to as low as ?26,000 (7), making overweight/ obesity either the number two or number seven cause of death in adults in the United States, respectively. Considerable research effort has focused on determining the factors involved in the development of obesity in nonhuman animals; consequently, our understanding of these is substantial, but still far from complete. Somewhat surprisingly, less effort has focused on determining the factors involved in the reversal of obesity in nonhuman animals. We have contributed to these latter efforts by studying the reversal of a naturally occurring seasonal obesity in Siberian hamsters (Phodopus sungorus). In the process of conducting this work, we discovered the importance of the sympathetic nervous system (SNS) in lipid mobilization from white adipose tissue (WAT) as well as more recently realizing the possible importance of the sensory innervation of WAT. Several overviews of the role of the SNS in lipid mobilization were published recently (8-11). To give a better understanding of how we came to the realization that lipid mobilization occurs primarily through the sympathetic innervation of WAT, we will descri...

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Performance and carcass composition of docked and control fat-tailed Kellakui lambs

Cited by 20 publications

References 1 publication

Effect of tail docking in Awassi lambs on metabolizable energy requirements and chemical composition of carcasses

Effect of tail docking in Awassi lambs on metabolizable energy requirements and chemical composition of carcasses

Effects of tail docking on the expression of genes related to lipid metabolism in Lanzhou fat-tailed sheep

Thematic review series: Adipocyte Biology. Sympathetic and sensory innervation of white adipose tissue

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