Skeletal Muscle Characteristics of Broiler Chickens under Modified Incubation Factors

Stojanović, Slobodan; Ušćebrka, Gordana; Žikić, Dragan; Kanački, Zdenko

doi:10.3184/175815513x13803010044073

Cited by 2 publications

(3 citation statements)

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“…Our results suggest no significant effects of genotype and muscle on the nucleo-cytoplasmic ratio where values were between 0.015 and 0.017. But Stojanović et al (2013) shows that the value of the nucleo-cytoplasmic ratio in broiler chickens Ross hybrids, at the age of 42 days was 0.15. In the same study, it was shown that age has significant influence on this parameter.…”

Section: Discussionmentioning

confidence: 96%

“…These results are in accordance with authors who conclude that the autochthonous breeds have better meat quality then commercial hybrids (Pavlovski et al, 2012). In order to compare the volume density of connective tissue within the muscle of broiler (fast growing strains), Red-bro as medium growing strain and autochthonous breeds as slow-growing strains, we compared the results of our study and the results from earlier research done with broiler chickens (Stojanović et al, 2013). The results of our study showed that the volume density of connective tissue in pectoral muscle was from 16.19% at Red-bro to 26.59% at Sombor crested, while in broiler chickens the average value was 17.97 % in the pectoral muscle broiler chickens Ross 308 at 42 days (Stojanović et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

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Morphological characteristics of breast and thigh muscles of slow- and medium growing strains of chickens

et al. 2016

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Morphological characteristics of skeletal muscles of slow- and medium-growing strains of chickens are very important for meat quality and comparison with fast-growing strains. The aim of this paper was to evaluate morphological parameters of breast and thigh muscles of slow- and mediumgrowing strains in a free-range system. The slow-growing strains used in the experiment were autochthonous breeds Sombor crested and Banat naked neck, and the medium-growing strain was Red-bro. The tissue samples were taken from the thigh muscle and muscles of the breast of 10 chickens of each breed. Samples were stained with hematoxylin - eosin and enzyme succinate - dehydrogenase (SDH). The following morphological parameters were observed: diameter of muscle cells, nucleo-cytoplasmic ratio of muscle cells, volume density of connective tissue within the muscle and the presence of red, white and intermediate muscle cell types. Between strains, the type of muscle or genotype didn?t have significant effects on diameters of muscle cells and nucleo-cytoplasmic ratio in the muscle cells. Results indicated that genotype had significant effect on volume density of the connective tissue in breast muscles. Red muscle cells were, in all strains, significantly more represented in m. biceps femoris than m. pectoralis superficialis. Genotype had significant effect on ratio between connective tissue and muscle cells and no significant effects on other morphological parameters. [Projekat Ministarstva nauke Republike Srbije, br. TR 31033]

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Morphological characteristics of breast and thigh muscles of slow- and medium growing strains of chickens

et al. 2016

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“…Percentage measurements were performed using the M42 testing system described elsewhere [4,19,22,28], which basically consists of 21 line segments and 42 points in the testing area. For stereological analyses, the following formulas were used:…”

Section: Histological Analysismentioning

confidence: 99%

Histological and Morphometric Examination of the Testes of Boars and Male Pigs Immunocastrated with Improvac®

Stojanović

Ušćebrka

Žikić

et al. 2017

Acta Scientiae. Vet.

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Background: Surgical castration of male piglets is frequently performed to prevent development of an unpleasant taste and flavor in meat of mature males, called boar taint. Disadvantages of this method are primarily related to the lower feed efficiency of surgically castrated male pigs, production of less lean meat and more fat on the carcasses than boars, as well as ethical issues associated with the procedure itself. Immunocastration is a method of immunization against gonadotropinreleasing hormone (GnRH) and represents an alternative to avoid boar taint. This study aimed to examine the influence of immunocastration on histological and morphometric parameters of male pig testes.Materials, Methods & Results: A total of 60 crossbred male pigs selected from 30 litters were assigned to two experimental groups: boars (n = 30) and immunocastrated males (n = 30). Two doses (2 mL per dose) of the Improvac® vaccine were given to pigs scheduled for immunocastration. The first injection was given at 10 weeks of age, and the second injection at 20 weeks of age. All pigs were fed the same commercial diet ad libitum, group-housed (15 pigs/pen) and slaughtered at 25 weeks of age. After slaughter, testicle weights were measured and samples of testicular tissue were taken for histological examination. Immunocastrated males had lower testicle weights than boars (P < 0.01). Furthermore, structural damage to the germinal epithelium was visible in the seminiferous tubules of vaccinated pigs. In the testicular interstitium of these animals, the number of Leydig cells were reduced; almost all of these cells exhibited different degrees of abnormality. Moreover, the diameter of the seminiferous tubules and thickness of the germinal epithelium were greater (P < 0.01), and the percentage of germinal epithelium in the seminiferous tubules as well as percentage of blood vessels in the interstitium were higher in boars as compared to immunocastrated males (P < 0.01). Seminiferous tubule lumen diameter was greater (P < 0.01), and percentage of lumen in the seminiferous tubules as well as percentage of non-blood vessel tissue in the interstitium were higher in immunocastrated males than boars (P < 0.01).Discussion: Vaccination against GnRH, as used in this study, reduced the synthesis of follicle-stimulating hormone (FSH) and luteinizing hormone (LH), which led to decreased spermatogenesis and androgen production. The smaller diameter of the seminiferous tubules as well as germinal epithelium thickness, and lower percentage of germinal epithelium in the seminiferous tubules in immunocastrated males could be explained by reduced FSH synthesis, and subsequent reduced spermatogenesis. The described testicular malformations in immunocastrated animals caused their lower weight, and greater diameter of the lumen as well as a higher lumen percentage of the seminiferous tubules. The vaccine reduced LH synthesis, so the Leydig cells of immunocastrated animals had lower activity than the same cells in boars. The percentage of blood vessels in the interstitium of boar testes was higher, which was related to the blood supply required for normal function of Leydig cells. It was concluded that differences existed in the structure of the seminiferous tubules and interstitium between boars and immunocastrated males , which were reflected in values of the examined histological and morphometric parameters. The development of these differences was related to the inhibition of GnRH synthesis and secretion.

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Skeletal Muscle Characteristics of Broiler Chickens under Modified Incubation Factors

Cited by 2 publications

References 18 publications

Morphological characteristics of breast and thigh muscles of slow- and medium growing strains of chickens

Morphological characteristics of breast and thigh muscles of slow- and medium growing strains of chickens

Histological and Morphometric Examination of the Testes of Boars and Male Pigs Immunocastrated with Improvac®

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