2002
DOI: 10.1046/j.1439-0388.2002.00344.x
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Fat deposition in tropical sheep as adaptive attribute to periodic feed fluctuation

Abstract: Summary Ruminants adapt to periodic fluctuation in feed resources by accumulating fat stores during favourable periods. Thus, genetic variations, among ruminant genotypes, in the capacity to deposit fat could be exploited through breeding to improve animal productivity in traditional tropical production systems. Based on this premise, breed differences among weights of principal adipose depots and total body fat were estimated in Menz (n = 303) and Horro (n = 151) sheep of Ethiopia. Animals were kept on supple… Show more

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Cited by 42 publications
(38 citation statements)
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“…Ruminants store energy in adipose tissues when the quality and quantity of feed is 'adequate,' and mobilize it to meet energy demands during periods of scarcity (Ball et al, 1996;Ørskov, 1998;Nigussie et al, 2000;Ermias et al, 2002). In a tropical environment, where wet seasons alternate with dry seasons that are long and characterized with low quantity and quality of pasture, the ability to store fat during 'favorable' seasons, and its subsequent use for maintenance, pregnancy and lactation during 'unfavorable' season is an essential strategy for survival.…”
Section: Fat Deposition As Feed Reservementioning
confidence: 99%
“…Ruminants store energy in adipose tissues when the quality and quantity of feed is 'adequate,' and mobilize it to meet energy demands during periods of scarcity (Ball et al, 1996;Ørskov, 1998;Nigussie et al, 2000;Ermias et al, 2002). In a tropical environment, where wet seasons alternate with dry seasons that are long and characterized with low quantity and quality of pasture, the ability to store fat during 'favorable' seasons, and its subsequent use for maintenance, pregnancy and lactation during 'unfavorable' season is an essential strategy for survival.…”
Section: Fat Deposition As Feed Reservementioning
confidence: 99%
“…Frutos et al (1995) found that ewes of Churra breed had a high proportion of internal fat compared with Merino ewes (meat breed) and that distribution of internal dissected fat was different among breeds, recording that omental depot was greater for Churra ewes and the mesenteric depot, greater for Merino ewes. The above suggests that the accumulation of body fat in more common depots results from adaptation of the animals to specific environmental conditions (climatic, nutritional; Sprinkle et al 1998;Ermias et al 2002). Sheep have their origin in cold environments, deposit more subcutaneous fat (CF) as compared to some breeds of cattle and sheep from warm environments where the caloric load is greater (Kempster 1980).…”
Section: Fat Deposition and Distributionmentioning
confidence: 99%
“…It has been hypothesized that fat storage may be energetically more efficient than forage conservation under tropical conditions (Ørskov 1998). On the other hand, breed (Frutos et al 1995;Ermias et al 2002), sex (Lambe et al 2006), level of nutrition (Ribeiro et al 2008), and physiological state (Lambe et al 2006;Mendizabal et al 2007) play a significant role in the amount and distribution of body fat depots; moreover, breeds selected for prolificacy and milk production accumulate a larger proportion of total fat as internal fat depots; whereas, in meat breeds, a larger proportion of body fat is in the carcass (Kempster 1980;Lambe et al 2006;. In addition, when energy intake is low, fat reserves may be mobilized for milk synthesis during stages of high energy demands such as in early lactation; but when energy reserves are limited, this may exert a negative effect on postpartum ovarian activity (Chilliard et al 1998;Friggens 2003;Butler 2003;Forcada and Abecia 2006).…”
Section: Introductionmentioning
confidence: 99%
“…These same authors observed an increased fat deposition in the omentum, mesentery, and pelvic and kidney regions. This is due to a genetic adaptation to harsh environmental conditions, and is common in other tropical sheep breeds (ERMIAS et al, 2002). …”
Section: Resultsmentioning
confidence: 99%