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Muscle tone is the tension in a muscle at rest, and it is important in determining an individual's physical fitness. In livestock, muscle tone is a crucial factor in assessing the quality of meat produced. The shape and muscle score of an animal are evaluated to determine its value, with muscle score being a measure of the thickness and convexity of the animal, independent of fatness. This is particularly important in the context of beef cattle, where the muscle shape and score influence the meat yield and overall beef production.
| Characteristics | Values |
|---|---|
| Definition | Muscle tone in livestock refers to the measure of fullness or roundness of the butt, which can be related to the live animal. |
| Scoring | Muscle tone is scored on a scale of A (full muscling) to E (least muscling). |
| Muscle shape | If one muscle is well-developed, other muscles on the animal will be of a similar shape. |
| Fat influence | Varying levels of fat on an animal influence its shape. The leaner the animal, the less the influence of fat on body shape, and the greater the influence of muscle. |
| Live animal assessment | The degree of muscling is considered separately from the degree of fatness. |
| Muscle patterns | Three main sites on the animal allow for muscle patterns to be studied without the influence of fat cover: the width through the stifle region and along the back running from the hips to the shoulders. |
| Round, bulging muscle pattern | A steer with a round, bulging muscle pattern will have a well-rounded loin region and rounded muscle development running forward toward the shoulder and showing maximum width through the stifle region. |
| Narrow muscle pattern | Not as wide and well-rounded over the hipline, hip bones can be seen, has a narrower stance, and the stomach is clearly visible. |
| Conformation | Conformation is a common method to evaluate the shape of an animal or carcass, allowing fatness to play its full part in determining that shape. |
| Muscle score | Muscle score, unlike conformation, is a measure of shape without the influence of fatness. It evaluates the thickness (quantity) in a three-dimensional view of the whole body. |
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What You'll Learn
- Muscle shape in livestock is determined by the profile of the butt
- The AUS-MEAT language defines muscle shape as the fullness or roundness of the butt
- Muscle shape in cattle is highly predictable
- The shape of livestock can be evaluated by allowing fatness to play a part in determining that shape
- Muscle score, unlike conformation, is a measure of shape without the influence of fatness
Muscle shape in livestock is determined by the profile of the butt
Muscle shape in livestock, particularly cattle, is a crucial aspect of assessing their value. While fatness was historically a significant factor in determining the value of livestock, the focus has shifted to muscle score, which is a more accurate predictor of meat yield.
The muscle score of cattle is primarily determined by the profile of the butt, which provides a two-dimensional evaluation of the animal's shape. Specifically, the butt profile is assessed from the side, evaluating the convexity or roundness of the butt. This is distinct from the muscle score, which is a three-dimensional evaluation conducted from the back and focuses on thickness.
The AUS-MEAT language defines muscle shape or muscle score based on the fullness or roundness of the butt, using a scale from A (full muscling) to E (least muscling). This scale is also used for the butt profile, despite the difference in evaluation methods.
A well-muscled steer, when viewed from the rear, will exhibit a round, bulging muscle pattern. This pattern extends from the loin region towards the shoulder, with maximum width observed through the stifle region. Additionally, a wide, well-rounded topline and a wide stance are indicative of good muscle development.
By contrast, a less muscled animal will have a narrower stance, with visible hip bones and a stomach that is not obscured by the muscle mass. The muscle shape in livestock is, therefore, a critical factor in determining their value, meat yield, and overall assessment.
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The AUS-MEAT language defines muscle shape as the fullness or roundness of the butt
The AUS-MEAT language defines muscle shape in terms of the fullness or roundness of the butt. This is a measure of the degree of muscling in the animal, which can be observed in the live animal and related to the carcass. The muscle shape is scored on a scale of A (full muscling) to E (least muscling).
The shape of the carcass is determined by drawing an imaginary straight line from the butt of the tail to the outer area of the muscle attachment on the upper leg. The profile of the butt is then assessed in relation to this line. If an animal has a well-developed muscle, it is likely that its other muscles will be of a similar shape.
The degree of fat on an animal will influence its shape, but so does the degree of muscle. Leaner animals are less influenced by fat and more influenced by muscle. During live animal assessment, the degree of fatness is considered separately from the degree of muscling. There are three main sites on the animal that allow for the study of muscle patterns without the influence of fat cover: the width through the stifle region and along the back, from the hips to the shoulders.
When viewed from the rear, an animal with a round, bulging muscle pattern will have a well-rounded loin region and rounded muscle development running forward towards the shoulder, with maximum width through the stifle region. This type of muscle pattern will show pronounced movement of the muscles while in motion, with bulges forming over the rump and loin area.
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Muscle shape in cattle is highly predictable
During live animal assessment, the degree of muscling is considered separately from the degree of fatness. Three main sites on the animal allow for muscle patterns to be studied without the influence of fat cover: the width through the stifle region and along the back, running from the hips to the shoulders.
Viewed from the rear, a steer with a round, bulging muscle pattern will have a well-rounded loin region and rounded muscle development running forward toward the shoulder, showing maximum width through the stifle region. A steer with a flat or angular muscle pattern will fall away along the borderline when viewed from the rear, showing little roundness over the loin region, and will have its widest rear viewpoint much higher, up towards the tailhead. The hip bones and the stomach wall are more easily seen from the rear on a lightly muscled animal.
The AUS-MEAT language defines the measure for muscle shape on the carcass as the fullness or roundness of the butt, which can be related to the live animal, and is scored on a scale of A (full muscling) to E (least muscling). Butt Profile, a shape index developed by Ausmeat, is a two-dimensional view of the carcass as seen from the side. It is significantly affected by carcass fatness.
Muscle scorers should not use Ausmeat Butt Profile to test their ability as scorers because they are completely different evaluations of shape. Butt profile is of little use in evaluating carcass worth. However, muscle score, because it is evaluated independently of fatness, adds to the prediction of animal or carcass value over and above an assessment of fatness alone.
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The shape of livestock can be evaluated by allowing fatness to play a part in determining that shape
The shape of livestock is an important factor in determining their value. One of the most common methods to evaluate the shape of an animal is to consider its fatness, a method referred to as 'conformation'. Conformation is the evaluation of the thickness and convexity of the animal relative to its size, including the influence of fatness. As the fat score of an animal increases, so does the dressing %, as much of the extra fat remains on the carcass.
However, it is important to note that muscle score, which is an evaluation of the thickness of the animal from a three-dimensional view, also plays a significant role in determining the shape of livestock. Muscle score discounts for fatness and focuses on the muscle shape and development of the animal. Well-developed muscles in livestock are associated with a round, bulging muscle pattern, which results in a pronounced movement of the muscles while in motion. For example, bulges can be observed over the rump and loin area of the animal while walking, indicating a well-rounded topline and maximum width through the stifle region.
The AUS-MEAT language defines muscle shape as the fullness or roundness of the butt, scored on a scale from A (full muscling) to E (least muscling). Similarly, muscle score uses scores from A to E to evaluate the butt profile, which is a two-dimensional side view of the animal's convexity. On the other hand, the muscle score is a three-dimensional evaluation of thickness as seen from the back of the animal.
While fatness plays a role in determining the shape of livestock, it is important to consider muscle development as well. The degree of muscling and fatness are considered separately during live animal assessments. By evaluating both conformation and muscle score, a comprehensive understanding of the shape and value of livestock can be achieved.
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Muscle score, unlike conformation, is a measure of shape without the influence of fatness
Muscle score is a measure of the shape of cattle, specifically the thickness or convexity of an animal relative to its frame size, after adjustments have been made for fatness. It is important to distinguish muscle score from conformation, as the latter is influenced by fatness. Muscle score, on the other hand, is evaluated independently of fatness and is a more accurate predictor of animal or carcass value.
The distinction between muscle score and conformation is particularly important in the context of livestock assessment. Conformation refers to the physical structure and appearance of an animal, which can be influenced by fat cover. However, muscle score focuses solely on the degree of thickness or convexity of the animal's muscles, regardless of fatness.
The muscle score of cattle is determined by assessing specific sites on the animal that allow for the study of muscle patterns without the influence of fat cover. These sites include the width through the stifle region and along the back, from the hips to the shoulders. A well-developed muscle in one area is indicative of similar muscle development throughout the animal. Additionally, the movement of the animal can provide insights into its muscle pattern, with noticeable muscle movements such as a 'pop' or 'jump' above the hip bone when walking.
The muscle score is typically graded on a scale, with ''A' representing a high score and 'E' indicating a low score. This grading system can be further refined by incorporating pluses and minuses to provide a more nuanced assessment. The muscle score has significant implications for the meat industry, as it has been shown that higher-muscled animals not only yield more total meat but also have lower overall fat content.
In summary, muscle score is a valuable tool for assessing the shape and muscularity of livestock, particularly in the context of beef cattle. By evaluating muscle thickness and convexity independently of fatness, muscle score provides a more accurate prediction of an animal's value and potential meat yield. This distinction from conformation, which is influenced by fatness, underscores the importance of muscle score in livestock assessment and carcass evaluation.
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Frequently asked questions
Muscle tone in livestock refers to the amount of muscle on an animal's body, which can be assessed through live animal evaluation or carcass evaluation after slaughter.
Muscle tone is important because it affects the meat yield and quality. Buyers often judge livestock based on their muscle score, which indicates the thickness and convexity of the animal relative to its size, discounting subcutaneous fat.
Muscle tone can be assessed through visual observation and palpation. For live animals, observers note the fullness or roundness of the butt, muscle development, and fat cover. Carcass evaluation involves a more detailed analysis of muscle shape and volume.
Yes, one technique is to observe four or five cattle before sale and then follow them through the abattoir to compare their live assessment with their carcass evaluation. This helps improve assessment skills and provides direct feedback on the stock being produced.
Muscle tone is influenced by genetics, nutrition, and management practices. Selection for muscle score in breeding animals can result in progeny with higher muscle scores. Proper nutrition and management can also impact muscle development and tone.
