(CIHEAM, 1995) Purroy Unanua, Antonio; Mendizábal Aizpuru, José Antonio; Soret Lafraya, Beatriz; Horcada, Alberto; Lizaso, G.; Mendizábal Múgica, Francisco Javier; Arana Navarro, Ana; Producción Agraria; Nekazaritza Ekoizpena
The size and number of adipocytes of different fat depots was studied in 45 male lambs of the
Rasa Aragonesa breed, distributed in three groups of 15 lambs (G12, G24, G36), slaughtered respectively at
11.7 ± 0.67,24.5 ± 0.57 and 35.8 ± 1.74 kg live weight (LW) and at an age of 32 ± 5, 89 ± 8 and 123 ± 8 days.
G12 lambs were slaughtered on the day of weaning, G24 and G36 lambs were weaned respectively at
16.2 ± 1.32 and 18.3 ± 2.46 kg LW and were fed from then onwards on concentrated fodder and barley straw
ad libitum until they were slaughtered. The results obtained show that there is a significant increase in the
amount of fat deposited in three internal (omental, mesenteric and kidney knob and channel) fat depots as the
LW at slaughter increases (P<0.01). A similar phenomenon occurs in the size of the adipocytes, hypertrophy
being more evident between 24 and 36 kg (P<0.01) than between 12 and 24 kg, except in the intermuscular fat
depot, where the differences were between the two most extreme weight(P <0.01). The number of adipocytes
in the omental and mesenteric fat depots increased significantly during the period of the study (P<0.01) while
no variation occurred in the kidney knob and channel fat depot during the same period.
