Influence of nutrient restriction and realimentation on protein and energy metabolism, organ weights, and muscle structure in growing rats

Schadereit, R.; Klein, Martin J.; Rehfeldt, Charlotte; Kreienbring, F.; Krawielitzki, K.

doi:10.1111/j.1439-0396.1995.tb00459.x

Cited by 10 publications

(2 citation statements)

References 31 publications

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“…the rate of deposition of fat and protein. Thornton et al (1979) and Schadereit et al (1995) suggested that fat deposition changes markedly as an animal increases in maturity and this biological effect overcomes that effect of a low rate of gain. Our Eq.…”

Section: Bcmentioning

confidence: 99%

Energy requirement for maintenance and growth of Nellore bulls and steers fed high-forage diets

Tedeschi

Boin

Fox

et al. 2002

Journal of Animal Science

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Data from three comparative slaughter experiments with individually fed Nellore bulls (n = 31) and steers (n = 66) were utilized to determine their NEm and NEg requirements when fed high-forage diets. The experimental design provided ranges in ME intake, BW, and ADG for the development of regression equations to predict NEm and NEg requirements. The Nellore bulls (Trial 1) were divided into two intake levels (ad libitum and 65% of the ad libitum). The steers (Trials 2 and 3) were allocated to three intake levels (ad libitum and 55 and 70% of the ad libitum). In both trials, there were three slaughter groups within each intake level. The three end points for the bulls were different days on treatment (100, 150, and 190 d and 130, 180, and 200 d, respectively, for older and younger animal subgroups). The steers were slaughtered when animals of the ad libitum treatment reached 400, 440, and 480 kg shrunk BW (SBW) on average for the first, second, and third group, respectively. For all body composition determinations, whole empty body components were weighed, ground, and subsampled for chemical analysis. In each of the trials, initial body composition was determined with equations developed from a baseline slaughter group, using SBW and empty BW (EBW), fat (EBF), and protein (EBP) as variables. The NEm was similar for bulls and steers; NEm averaged 77.2 kcal/ kg0.75 EBW. However, the efficiency of conversion of ME to net energy for maintenance was greater for steers than for bulls (68.8 and 65.6%, respectively), indicating that bulls had a greater ME requirement for maintenance than steers (5.4%; P < 0.05). Our analyses do not support the NRC (2000) conclusion that Nellore, a Bos indicus breed, has a lower net energy requirement for maintenance than Bos taurus breeds. An equation developed with the pooled data to predict retained energy (RE) was similar to the NRC (2000) equation. A second equation was developed to predict RE adjusted for degree of maturity (u): RE = (6.45 - 2.58/u) x EWG x e(0.469) x u), where u = current EBW/final EBW in which final EBW was 365 kg for steers and younger bulls and 456 kg for older bulls at 22% EBF, respectively.

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Section: Bcmentioning

confidence: 99%

Energy requirement for maintenance and growth of Nellore bulls and steers fed high-forage diets

Tedeschi

Boin

Fox

et al. 2002

Journal of Animal Science

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“…It is well evidenced that in amniotes, Pax7 muscle progenitor cells participate in both processes in the prenatal stage. It is noteworthy that, after birth, a number of muscle fibres remain unchanged in mammals and birds (Rowe and Goldspink 1969 ; Fowler et al 1980 ; Nimmo and Snow 1983 ; Brown 1987 ; Rosenblatt and Woods 1992 ; Schadereit et al 1995 ). Postnatal growth is mainly due to hypertrophy, although some reports have revealed an increase in fibre number shortly after birth (Swatland 1975 ; Rehfeldt and Fiedler 1984 ; Summers and Medrano 1994 ; Fiedler et al 1998 ).…”

Section: Introductionmentioning

confidence: 99%

Unique features of myogenesis in Egyptian cobra (Naja haje) (Squamata: Serpentes: Elapidae)

et al. 2015

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During early stages of myotomal myogenesis, the myotome of Egyptian cobra (Naja haje) is composed of homogenous populations of mononucleated primary myotubes. At later developmental phase, primary myotubes are accompanied by closely adhering mononucleated cells. Based on localization and morphology, we assume that mononucleated cells share features with satellite cells involved in muscle growth. An indirect morphological evidence of the fusion of mononucleated cells with myotubes is the presence of numerous vesicles in the subsarcolemmal region of myotubes adjacent to mononucleated cell. As differentiation proceeded, secondary muscle fibres appeared with considerably smaller diameter as compared to primary muscle fibre. Studies on N. haje myotomal myogenesis revealed some unique features of muscle differentiation. TEM analysis showed in the N. haje myotomes two classes of muscle fibres. The first class was characterized by typical for fast muscle fibres regular distribution of myofibrils which fill the whole volume of muscle fibre sarcoplasm. White muscle fibres in studied species were a prominent group of muscles in the myotome. The second class showed tightly paced myofibrils surrounding the centrally located nucleus accompanied by numerous vesicles of different diameter. The sarcoplasm of these cells was characterized by numerous lipid droplets. Based on morphological features, we believe that muscle capable of lipid storage belong to slow muscle fibres and the presence of lipid droplets in the sarcoplasm of these muscles during myogenesis might be a crucial adaptive mechanisms for subsequent hibernation in adults. This phenomenon was, for the first time, described in studies on N. haje myogenesis.

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Energy Expenditure and Quantitative Oxidation of Nutrients in Rats (Rattus norvegicus) Kept in Different Thermal Environments and Given Two Levels of Dietary Fiber

Zhao

Jørgensen

Just

et al. 1997

Comparative Biochemistry and Physiology Part A: Physiology

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Influence of nutrient restriction and realimentation on protein and energy metabolism, organ weights, and muscle structure in growing rats

Cited by 10 publications

References 31 publications

Energy requirement for maintenance and growth of Nellore bulls and steers fed high-forage diets

Energy requirement for maintenance and growth of Nellore bulls and steers fed high-forage diets

Unique features of myogenesis in Egyptian cobra (Naja haje) (Squamata: Serpentes: Elapidae)

Energy Expenditure and Quantitative Oxidation of Nutrients in Rats (Rattus norvegicus) Kept in Different Thermal Environments and Given Two Levels of Dietary Fiber

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