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Abstract
Changes in the cellularity of various adipose tissues in growing cattle were analyzed. Fifty male cattle were slaughtered between 15 and 65% of mature weight. The whole adipose mass, separated by dissection, was divided into three parts: subcutaneous, intermuscular, and internal adipose tissues. Lipid content, cell size and distribution, as well as cell number of these three parts were determined. Adipose cells became 15 times greater from 15 to 65% mature weight, whereas total adipose cell number increased only 1.8-fold. However, a significant hyperplasia occurred near 45% mature weight. These results suggested a cell size regulation by hyperplasia. Over the whole period studied (15-65% mature weight), hyperplasia was far higher in subcutaneous adipose tissue than in other tissues. This is discussed as related to the higher relative growth of this tissue. In each fatty tissue, two identical development periods were observed. Each of them began by an increase in small-sized cells (hyperplasia) followed by the filling of these cells (hypertrophy). These two periods were particularly clear in the case of subcutaneous tissue, in which the second hyperplasia occurred slightly later than in other fatty tissues. So, in all respects, subcutaneous fatty tissue appears to develop later than other tissues studied.
Highlights
Changes in the cellularityof various adipose tissues in growing cattle were analyzed
Fifty 4-month-old bulls, 25 Charolais and 25 Friesian, were randomly divided in each breed into one group offive, a n d five groups of four animals. These six groups of animals from each breed were slaugh
Afte3r 5% mature body weight, tissue development is better understood. The animals of both breeds were fed the same diet, it is interesting to know the changes in adipose cell 82% concentrate and 18% hay, ad libitum
Summary
Fifty 4-month-old bulls, 25 Charolais and 25 Friesian, were randomly divided in each breed into one group offive, a n d five groups of four animals. 65% oftheestimated mature body weight (900 and 1,100 kg for Friesian and Charolais breeds, respectively). The animals of both breeds were fed the same diet, it is interesting to know the changes in adipose cell 82% concentrate and 18% hay, ad libitum. The mean size and number during growth, in relation to the growtrhatoeafnimals was close to 1 kg/day, deposition of fat in domestic animals. These changes slightly higher between 15 and 45% mature weight, have been studied extensively over the last ten years and slightly lower thereafter. This study is only concerned with the mean evolution ofcellularitywith age (see section on statistical analysis)
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