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Growth and development (Genetic sizing scaling rules - Metabolic age = t…
Growth and development
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The differences in fat and protein efficiency mean animals of a large mature size and an equal weight to other animals will be depositing more protein and therefore be more efficient
Maternal ability
size of animal at birth will be affected by maternal ability. This has clearly been shown in horses using embryo transfer
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When animals that have undergone a period of food restriction are fully fed they grow faster than animals of a similar weight or age that have not been restricted
This will be influenced by the stage of maturity at restriction, the severity and duration of restriction, the quality of the nutrients fed and the length of the recovery period
Compensatory growth - Grass beef: beef that have a partial restriction in winter (reducing ADG to 0.5) when re-fed in summer will grow faster than non restricted animals reaching equal/higher weights - However days needed to reach these weights will increase
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FCE= Kg gain/Kg food, FCR=Kg food/ Kg gain
Growth rate and FCE have a high genetic correlation, Selection for one will result in indirect selection for the other
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Allometric equation
Y=aX ^b
Y= weight of a part, X= weight of the whole and b is a constant known as the allometric coefficient
Coefficient is different depending on the earliness in maturity of the part. For early maturing tissue it is less than one, for late maturing tissue it is greater than one and for tissue that is a constant portion of the whole it is equal to one
Examples : Muscle is in constant proportion, Fat is late maturing and Bone is early maturing
Muscle and bone - considered essentail fat is considered non essential. therefore the plane of nutrition will have mininimal effect of bone and muscle differences but will have a large effect on fat in comparison to bone and muscle
As energy intake increases daily gain will increase but after the genetic maximum growth rate of muscle is reached this will become excess energy stored as fat
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