Effect of protein-energy restriction, pregnancy and lactation on the development of long bone in growing sheep

Funaba, Masayuki; Saita, Jiro; Nokubo, T.; Kaneko, Oriyoshi; Kanagawa, Yoshihiro; Yano, Hideo; Kawashima, Ryoji

doi:10.5713/ajas.1990.125

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“…Dietary protein is also important for bone growth as it provides the basis for the bone matrix, influences Ca absorption and most importantly is an important determinant of the concentration of a number of hormones that directly affect bone cell proliferation and differentiation. Studies with growing calves (Kanagawa et al 1986) and sheep (Funaba et al 1990) demonstrated that restricting energy and protein intake decreased the cortical bone thickness and the diameter, length and width of the tibial bones. Similarly, Searle et al (1989) reported that long bone growth was affected by feed restriction.…”

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confidence: 99%

Skeletal growth in cattle in response to nutritional and hormonal manipulation

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Section: Introductionmentioning

confidence: 99%

Skeletal growth in cattle in response to nutritional and hormonal manipulation

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Changes in nitrogen balance with age in calves weaned at 5 or 6 weeks of age1

Funaba

Kagiyama

Iriki

et al. 1994

Journal of Animal Science

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Three experiments were conducted to examine the changes of N utilization after early weaning in calves. In Exp. 1, eight male Holstein calves were weaned at 5 wk of age and N balance was determined on the 1st, 6th, 11th, and 19th wk after weaning. In Exp. 2, to examine the effect of weaning age on N utilization, three calves were weaned at 5 wk of age and the other three at 11 wk of age. The N balance of both groups was determined on the same weeks of age (i.e., the 1st, 6th, 8th, and 11th wk after weaning in the earlier-weaned group). In Exp. 3, to examine the effect of a higher content of CP (17.9%) and TDN (75%) in concentrate on N utilization, three calves were weaned at 6 wk of age and the N balance was determined on the 1st, 5th, 10th, and 20th wk after weaning. The intake of concentrate was low in wk 1 but rapidly increased in the next 5 wk (1.74 and 1.72 times in Exp. 1 and 2, respectively). Nevertheless, the TDN intake tended to be lower in calves weaned early just after weaning compared with that in suckling calves in Exp. 2. The apparent N digestibility steadily increased with age and reached a plateau on wk 11 and 6 after weaning in Exp. 1 and 2, respectively. Conversely, the ratio of N retained:N absorbed tended to be high up to wk 6 after weaning and thereafter decreased, leading to a transient high N retained:N intake ratio on wk 6 after weaning.(ABSTRACT TRUNCATED AT 250 WORDS)

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Effect of protein-energy restriction, pregnancy and lactation on the development of long bone in growing sheep

Cited by 2 publications

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Skeletal growth in cattle in response to nutritional and hormonal manipulation

Skeletal growth in cattle in response to nutritional and hormonal manipulation

Changes in nitrogen balance with age in calves weaned at 5 or 6 weeks of age1

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