Growth of nursery-raisedMacaca nemestrina infants: Effects of feeding schedules, sex, and birth weight

Autor: Gene P. Sackett, Gerald C. Ruppenthal
Rok vydání: 1992
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Zdroj: American Journal of Primatology. 27:189-204
ISSN: 1098-2345
0275-2565
DOI: 10.1002/ajp.1350270304
Popis: Ponderal growth, caloric intake, growth velocity, and growth efficiency were studied from birth through 90 days in 523 nursery-raised pigtailed macaque infants. The male and female subjects ranged in birth weight from the 1st through 100th centiles of the colony distribution and were all judged to be clinically healthy. One group of infants was fed on an ad lib schedule, with formula continuously available from dispensers which were replenished every 8 h. A second group was fed on a distributed regimen, with formula available on a 4-h-on/4-h-off schedule. The latter schedule was instituted because of bacterial growth in the milk after 4 h. Infants fed the distributed diet had 20-25% lower caloric intake than those fed ad lib, but equaled or exceeded ad lib infants in body weight, growth velocity, and grams gained per 100 kilocalories (growth efficiency). The poorer utilization of calories by the ad lib group was attributed to a combination of bacteria in the milk, which caused diarrhea, and inability to metabolize the excess nutrients gained from overconsumption of fluids. The effects of the distributed diet occurred for both males and females, and across the full range of birth weights. Peak velocity and growth efficiency for both males and females occurred at 2 weeks after birth for high-birth-weight (HBW) infants and at 3 weeks for low-birth-weight (LBW) infants. However, the growth efficiency of LBW infants was equal to, or greater than, that of HBW infants after postnatal day 2. Descriptive statistics and regression equations based on this large sample are presented for quantitative comparisons of growth parameters with those of other primate species reared in laboratory or field settings. © 1992 Wiley-Liss, Inc.
Databáze: OpenAIRE
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