150 finalshd f

150 finalshd f - In some species puberty is delayed if...

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In some species, puberty is delayed if young animal subjected so under nutrition or has suffered retarded growth Maternal adaptations to pregnancy include a redistribution of cardiac output to favor increased perfusion of the pregnant uterus.------part of adaptation due to increased estrogen during pregnancy, causing an increase in uterine blood flow Sometimes the set points for systolic and diastolic arterial pressure are changed to that a transient physiologic hypertension prevails Genetic determinants of growth include breeds, individuals. Growth is easily modified by selection. Nutritional adequacy and stressors are also important for growth. Proper nutrition is important to the process of translation in growth because dietary protein quality is important to provide the right mix of amino acids. It is the concept of limiting amino acids. Energy is also required for protein synthesis; it demands a lot of it. Fetal growth can vary significantly within the same genotype. Limiting factors are maternal nutrition and placenta size with both influence fetal nutrient supply. The fetus relies completely on placental transfer of nutrients from maternal circulation. Both adequate energy and protein intake are critical for maximizing muscle growth rate and minimizing fat deposition Rate of skeletal muscle growth can be enhanced through genetic selection, but it is also responsive to endocrine status. A critical event of milk secreting power of cattle udder occurs around time allometric growth sets into puberty----rate of growth and degree of fatness has large impact on lactation performance in cattle. --Heifers that are excessively fat at puberty tend to perform less optimally Fat pad might have something to do with this which is dominating the mammary at this time--- sequestering of steroid hormones into the fat stores of the body may explain this The positive energy balance suppresses GH to the extent that the hormone becomes limiting for optimal mammogenesis Animals with above normal feed intake have higher rates of hepatic blood perfusion and as a result usually have lower than normal concentrations of steroid hormones in their blood. The huge metabolic and nutritional need for lactation outstrip the capacity for nutrient intake by animal
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This note was uploaded on 03/26/2008 for the course AN SC 150 taught by Professor Butler,wr during the Spring '06 term at Cornell.

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150 finalshd f - In some species puberty is delayed if...

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