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Influence of sex on cellularity and lipogenic enzymes of Spanish lamb breeds (Lacha and Rasa Aragonesa)

Published online by Cambridge University Press:  02 September 2010

J. A. Mendizabal ,
B. Soret ,
A. Purroy ,
A. Arana  and
A. Horcada
J. A. Mendizabal
Affiliation:
ETSIA, Universidad Pùblica de Navarra, Campus de Arrosadìa, 31006 Pamplona, Spain
B. Soret
Affiliation:
ETSIA, Universidad Pùblica de Navarra, Campus de Arrosadìa, 31006 Pamplona, Spain
A. Purroy
Affiliation:
ETSIA, Universidad Pùblica de Navarra, Campus de Arrosadìa, 31006 Pamplona, Spain
A. Arana
Affiliation:
ETSIA, Universidad Pùblica de Navarra, Campus de Arrosadìa, 31006 Pamplona, Spain
A. Horcada
Affiliation:
ETSIA, Universidad Pùblica de Navarra, Campus de Arrosadìa, 31006 Pamplona, Spain
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Abstract

The effect of sex on the size and number of adipocytes and on the lipogenic enzyme activity in different fat depots in Lacha (L) and Rasa Aragonesa (RA) lambs was studied. Male and female L lambs were fed on ewe milk and were slaughtered at 25 and 24 days of age corresponding to 11·4 and 10·9 kg live weight (UN), respectively. Male and female RA lambs were weaned at 58 days (16·0 kg LW) and were then given concentrates and barley straw until slaughtered at 89 and 91 days of age corresponding to 24·5 and 23·1 kg LW, respectively. A number of parameters were studied in omental (OM), mesenteric (MES) and kidney knob and channel fat (KKCF) depots including the amount of fat, the number and size of adipocytes and the activity of the following enzymes: glycerol 3-phosphate dehydrogenase (G3PDH), fatty acid synthetase (FAS), glucose 6-phosphate dehydrogenase (G6PDH) and NADPmalate dehydrogenase (MD). In subcutaneous (SC) and intermuscular (IM) depots, all the former parameters except the adipocyte number were studied. Females of both breeds had higher amounts of adipose tissue than males in the internal fat depots (P < 0·05) as well as larger adipocytes, mainly in the KKCF (P < 0·05 andP < 0·001 for L and RA lambs, respectively) and OM (P < 0·05 in the RA lambs) depots. There were no differences between sexes in the number of adipocytes. The activity of the G3PDH enzyme was higher in females than in males in OM and SC depots (P < 0·01) in L lambs, and in KKCF, IM (P < 0·05), OM and MES (P < 0·001) depots in RA lambs. Thus, the sex effect on adiposity in both breeds studied involved a greater fattening of the females which was consistent with a greater hypertrophy and a higher G3PDH activity.

Keywords

adipocytesfatlambslipogenesissex
Type
Research Article
Information
Animal Science , Volume 64 , Issue 2 , April 1997 , pp. 283 - 289
Copyright
Copyright © British Society of Animal Science 1997

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