Growth and carcass characteristics of Angus and American Wagyu steers

Lunt, D. K.; Riley, R. R.; Smith, Stephen B.

doi:10.1016/0309-1740(93)90081-r

Cited by 85 publications

(69 citation statements)

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“…The lack of a breed effect on marbling score was unexpected since others have reported greater marbling in Wagyu crosses (Lunt et al 1993;Mir et al 1997). Two differences between the present experiment and the above two experiments could explain this discrepancy.…”

Section: Breed Effectscontrasting

confidence: 74%

“…A number of dietary, genetic and other factors contribute to the differences in marbling that occur in beef carcasses (Jones et al 1991;Kauffman et al 1968;Koch et al 1976;Lunt et al 1993;Swortzel et al 1984). Japanese Wagyu cattle exhibit a high degree of marbling; however, it is not known if this is due to genetics, or feeding and management, or a combination of both (Lunt et al 1993).…”

Section: Mots Clésmentioning

confidence: 99%

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Effect of Wagyu genetics on marbling, backfat and circulating hormones in cattle

Mears¹,

Mir²,

Bailey³

et al. 2001

Can. J. Anim. Sci.

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. 2001. Effect of Wagyu genetics on marbling, backfat and circulating hormones in cattle. Can. J. Anim. Sci. 81: 65-73. Backfat depths, marbling scores, and concentrations of plasma insulin, cortisol, triiodothyronine (T3), and thyroxine (T4) were determined in 394 calves with and without Wagyu genetics. Hormone concentrations were determined three to five times for hormones between weaning and slaughter. Calves were weighed and backfat was ultrasonically determined at 28-d intervals, and assigned for slaughter when ultrasonic backfat depths approached 12 mm. Heifers weighed less (P < 0.001) and had more backfat (P < 0.05) and more marbling (P < 0.05) than steers at slaughter. Breed influenced slaughter weight (P < 0.001) and average backfat depth (P < 0.001), with Wagyu/Angus and Wagyu/Hereford crosses and Angus purebreds generally having greater backfat depths and lower slaughter weights than other crosses and purebreds. Marbling scores were not affected by breed (P > 0.1), although Wagyu crosses had more marbling (P < 0.05) compared with purebreds when variability in marbling due to differences in backfat depth was removed. Plasma cortisol, T3 and T4 were affected by calf breed, although there were no clear patterns for groups of breeds or breed crosses. There was a slight trend (P < 0.2) towards higher insulin levels and lower cortisol, T3 and T4 levels in some groups of calves with more backfat. Higher mean levels (P < 0.05) of T3 and T4 were found in all but one group of animals with more marbling. Thus, thyroid hormones may have a role to play in enhancing marbling in cattle. Les génisses étaient moins lourdes (P < 0,001) que les bouvillons à l'abattage, mais elles présentaient plus de gras dorsal (P < 0,5) et un meilleur persillé (P < 0,05). La race influe sur le poids à l'abattage (P < 0,001) et une couche de gras dorsal d'épaisseur moyenne (P < 0,001), les hybrides Wagyu/Angus et Wagyu/Hereford et les Hereford purs se caractérisant généralement par une couche plus épaisse de gras dorsal et un poids plus faible à l'abattage que les autres croisements ou races pures. L'état du persillé n'est pas affecté par la race (P > 0,1), bien que les hybrides Wagyu présentent un meilleur persillé (P < 0,05) que les sujets de race pure quand on ne tient pas compte des variations attribuables aux fluctuations de l'épaisseur du gras dorsal. La concentration de cortisol, de T3 et de T4 dans le sang est affectée par la race du veau, même si aucune tendance ne se dessine clairement pour telle ou telle race ou certains croisements. On note une légère tendance (P < 0,2) à la hausse de la concentration d'insuline et à la baisse de la concentration de cortisol, de T3 et de T4 chez quelques groupes de veaux présentant une couche de gras dorsal plus épaisse. Tous les groupes caractérisés par un meilleur persillé sauf un présentaient une concentration moyenne plus élevée (P < 0,05) de T3 et de T4. Les hormones de la glande thyroïde pourraient donc jouer un rôle à ce niveau chez les bovins.

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Section: Breed Effectscontrasting

confidence: 74%

Section: Mots Clésmentioning

confidence: 99%

Effect of Wagyu genetics on marbling, backfat and circulating hormones in cattle

Mears¹,

Mir²,

Bailey³

et al. 2001

Can. J. Anim. Sci.

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show abstract

“…In addition, it was reported that plasma insulin concentration was positively related to carcass fatness in cattle (Trenkle and Topel, 1978). Japanese breed has a higher rate of deposition of intramuscular fat (Lunt et al, 1993) and a higher fat percentage in the carcass (Ozutsumi et al, 1984). Although both of leptin and insulin relate with lipid metabolism and change depending on amount of fat, leptin and insulin were not significantly correlated (r=0.02, P=0.03) in present study suggesting that they are not closely linked at neonate.…”

Section: Resultscontrasting

confidence: 54%

“…On the other hand, that in Japanese Black cattle fluctuated from 4 to 12 µIU/ml. Plasma insulin is partly affected by fat metabolism, and Japanese Black cattle have a unique fat deposition pattern which is characterized by a greater extent marbling (Lunt et al, 1993). This unique fat metabolism in Japanese Black calves might have affected fluctuation of insulin during neonatal period.…”

Section: Resultsmentioning

confidence: 99%

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Plasma leptin concentration during 45 days in pre-weaning Japanese Black and Holstein calves

Tokuda¹,

Shinde²

2003

J. Anim. Feed Sci.

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Leptin is mainly produced in adipose tissue and acts in the hypothalamus to regulate food intake. The objective of the present study was to examine the pattern of plasma leptin concentrations of calves during 45 days after birth and the effect of breed on leptin and insulin concentrations between Japanese Black and Holstein calves. Four Japanese Black and four Holstein calves were used. Animals were fed 10% of their body weight whole milk for a week after birth, and then milk replacer and commercial formula feed for growing calf at a level to meet the nutrient requirement. Body weights were measured on the day of birth and 45 days after birth. Blood samples were collected everyday for 1-6 days after birth, 2 days interval for 6-14 days after birth and 3 days interval 14-45 days after birth to determine plasma leptin and insulin concentrations. Body weight significantly (P < 0.05) increased as compared to day of birth at 45 days after birth. However, plasma leptin concentration slightly decreased (P < 0.05) as days after birth advanced throughout the experimental period. Plasma insulin concentration decreased (P < 0.05) drastically 3 days after birth in both breeds. Breed of the animals influenced on plasma leptin and insulin significantly (P < 0.05), and high values were observed in Japanese Black than in Holstein calves. It has been suggested that the rate of body fat contents in Japanese Black cattle is naturally higher than in Holstein cattle. Probably the high levels of plasma leptin and insulin in Japanese Black calves were affected by genetically body fat characteristics of each cattle, though it was not confirmed in present study.

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Distribution of intramuscular lipid throughout M. longissimus thoracis et lumborum in Japanese Black, Japanese Shorthorn, Holstein and Japanese Black crossbreds

Zembayashi

Lunt

1995

Meat Science

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Growth and carcass characteristics of Angus and American Wagyu steers

Cited by 85 publications

References 1 publication

Effect of Wagyu genetics on marbling, backfat and circulating hormones in cattle

Effect of Wagyu genetics on marbling, backfat and circulating hormones in cattle

Plasma leptin concentration during 45 days in pre-weaning Japanese Black and Holstein calves

Distribution of intramuscular lipid throughout M. longissimus thoracis et lumborum in Japanese Black, Japanese Shorthorn, Holstein and Japanese Black crossbreds

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