Muscle Growth in the Fetal and Neonatal Pig

Swatland, H. J.

doi:10.2527/jas1973.372536x

Cited by 59 publications

(47 citation statements)

References 2 publications

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“…However, a few cells possessed the characteristics of immature myotubes, i.e., filamentous material was present but unor ganized, as sarcomeres were unidentifiable. The appearance of unorganized filaments before the appearance of striated fibrils in immature myotubes confirms previous inve stigations of myogenesis in other species , 1965;Fischman, 1972;Platzer, 1978], The developmental relation between primary and secondary myofibers was previously investigated in fetal pig muscle by Swatland [1973], We also noted the same relative shift from a first-formed population of primary fibers to exclusively the secondary form or mature fiber morpho logy. In addition, the immature fibers that developed in close association with a pri mary fiber were frequently observed with pseudopodial processes projecting into inva ginations of the sarcolemma of the primary fibers ( fig.…”

Section: Resultssupporting

confidence: 71%

Ultrastructural Analysis of Skeletal Muscle Development in the Fetal Pig

Campion

Fowler

Hausman

et al. 1981

Cells Tissues Organs

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Myogenesis was investigated at the ultrastructural level in the fetal pig at 35, 52, 65, 80, 95 and 110 days of gestation. At each stage of gestation, the predominately type II fiber type portion of the peroneus longus and sartorius muscles was examined. The sequence of events for normal myogenesis in the pig was generally similar to that reported for the skeletal muscle of other vertebrate species. In addition, the time interval for sequential development of myogenesis was similar between the two muscles. Centrioles were identified in primary fetal fibers and also in secondary fibers. No morphological evidence of mitotic activity was found in the myonuclei. The organization of myofibers into fasciculi was unrelated both temporally and spatially to capillary and neural development.

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Section: Resultssupporting

confidence: 71%

Ultrastructural Analysis of Skeletal Muscle Development in the Fetal Pig

Campion

Fowler

Hausman

et al. 1981

Cells Tissues Organs

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“…In the present study, we demonstrated that the distribution of CA3 differed in transcription level during different times of muscle development, with the highest level in prenatal 65-day-old skeletal muscle from Tongcheng pigs, an essential stage of muscle development for increasing muscle fiber number (Swatland, 1973). Expression level distribution during development showed that the concentration of CA3 increased with age in the Soleus muscle of rats (Carter et al, 1984;Côté et al, 1993).…”

Section: Discussionmentioning

confidence: 80%

Molecular characterization and association analysis of porcine <i>CA3</i>

Wang

Zhu

Wang

et al. 2006

Cytogenet Genome Res

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Carbonic anhydrase 3 (CA3) is a member of the carbonic anhydrase family, which plays an important role in various cell processes. In this paper, molecular characterization revealed that CA3 genomic DNA consists of seven exons and six introns, spans about 10.5 kb and maps to porcine chromosome 4q11→q14. Results of expression profiles showed that the expression levels of CA3 increased in skeletal muscles from prenatal 33- to 65-day-old Chinese Tongcheng pigs. These levels subsequently decreased to a steady state in prenatal 90-day-old, postnatal 2-day-old, postnatal 28-day-old, and pregnant 65-day-old pigs. The expression patterns of Chinese Tongcheng pig embryos were different from that of Landrace pig embryos. CA3 was expressed at higher levels in skeletal muscle and liver than in kidney, lung, stomach, intestine, and brain, but was not detected in heart and spleen. Statistical analysis showed the CA3 gene polymorphism was different between Chinese indigenous and introduced commercial western pig breeds, and was associated with intramuscular fat content and percentage of ham of pigs.

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“…Beta fibres remain aerobic throughout their lifespan. This transformation occurs primarily due to changes in energy-producing enzymes and is accompanied by a rapid increase in fibre size (Swatland 1973). Differentiation into different muscle fibre types proceeds at different rates, and some enzymes show differentiation before others.…”

Section: Introductionmentioning

confidence: 99%

“…Fibre formation is known to be complete between 70 th and 90 th d after conception (Swatland, 1973, Wigmore & Stickland, 1983. The development of type II muscle fibres is estimated to begin approximately 55 days after conception in pigs (Swatland 1973). At birth, the cross sectional area of muscle fibres in gastrocnemius is the largest, while that in longissimus dorsi is the smallest.…”

Section: Introductionmentioning

confidence: 99%

Histochemical properties of fibre types in muscles of wild and domestic pigs and the effect of growth rate on muscle fibre properties

2004

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This study reports the results of a comparison of the histochemical properties of various types of porcine muscles in wild and domestic pigs. In domestic pigs, the influence of growth rates on these properties were studied in five muscles: longissimus dorsi (LD), semimembranosus (SM), gluteus superficialis (GS), infra spinam (IS) and masseter (MAS). The growth rate was expressed as (i) live weight (LW) at 165 ± 2d and (ii) daily LW gain from day 88 to day 165 (DG) on the experimental diet.LD, SM, GS and IS of wild pigs were found to contain a higher area percentage of oxidative type IIA fibres (type IIA% area ) and a lower percentage area of glycolytic type IIB fibres (type IIB% area ) than the same muscles of domestic pigs. The capillary density in the light muscles (LD, SM, GS) of wild pigs was twice that of domestic pigs, indicating higher oxidative capacity. In domestic pigs the cross sectional area of type IIB fibres (CSA IIB ) was markedly larger than the cross sectional area of type I (CSA I ) and IIA (CSA IIA ) fibres. The average fibre cross sectional area (CSA fibre ) was about the same in the muscles of wild and domestic pigs except in LD and SM, where the average fibre cross sectional area was approximately 25% smaller in wild pigs than in domestic pigs. This difference was caused by 1 the large cross sectional area of type IIB fibres in the light muscles of domestic pigs.In the light muscles of domestic pigs, the cross sectional area of type IIA fibres increased most with increasing growth rate. Growth rate influences muscle fibre properties only in light muscles, not in dark muscles.

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Muscle Growth in the Fetal and Neonatal Pig

Cited by 59 publications

References 2 publications

Ultrastructural Analysis of Skeletal Muscle Development in the Fetal Pig

Ultrastructural Analysis of Skeletal Muscle Development in the Fetal Pig

Molecular characterization and association analysis of porcine <i>CA3</i>

Histochemical properties of fibre types in muscles of wild and domestic pigs and the effect of growth rate on muscle fibre properties

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