Showing papers in "Journal of Animal Science in 1973"

Genetic Aspects of Beef Production among Holstein-Friesians Pedigree Selected for Milk Production

Abstract: To explore the potential of cattle to produce both milk and beef, the genetic aspects of beef production among Holstein‐Friesian bulls pedigree selected for milk were studied. The data included growth records of 504 bulls (DPT) by 120 sires (SPT) pedigree selected for progeny testing by American Breeders Service, 1964 to 1971. DPT bulls with proofs had an average predicted difference for milk (PMD) of +180 kilograms. The daughter average was 7,273 kg per lactation under varying herd conditions. Sires accounted for 10% of the variation in average daily gain (ADG), 10% in daily gain per 100 kg body weight (DG/100) and 16% in body weight, indicating substantial genetic variability in beef traits. Sire variance components for beef traits varied with age. There were wide ranges in estimated breeding value (EBV) and estimated transmitting ability (ETA) for beef traits among DPT and SPT bulls, respectively. Ranking EBV among DPT bulls and ETA among SPT bulls for beef traits and selecting the top 10% and 20%, respectively, showed high selection differentials, empirically reflecting the potential for genetic improvement

Body surface area of female swine.

Abstract: 27. Holt Geometry. All rights reserved. Name. Date. Class. LESSON. 10-4. Practice A. Surface Area of 3. surface area of a right prism with lateral area L and base area B. S. L. 2B. 4. surface . Give your answers in terms of . 9. 2 in. 2 in. 10. a . understanding thermal relations between swine and their SA=970 W "633, where SA=swine body sur. Hence, part of the difference between Brody's. find the surface area of the rectangular prism. Name of Surface Area. 2009, TESCCC 08101l09 page 51 0f 84 . Circle: Surface Area or Volume Formula: 2. Surface Area and Volume of Spheres. 3 Find the volume and surface area. 2. . compare, and contrast the words lateral area, base area, and surface area. 2..

Valine requirement of the lactating sow.

Abstract: An experiment was conducted using production and metabolic criteria to estimate the valine requirement of the lactating sow. Ground corn, gelatin, corn sugar, vitamins, minerals and indispensable amino acids were used to formulate a diet containing all the essential nutrients except valine. L-valine was added to provide .23 (basal), .38, .53, .68 and .83% valine. Twenty-five mature Landrace x Yorkshire sows were randomly assigned to the five dietary treatments. Milk production and average pig weight gain increased quadratically (P less than .01) and were maximized at .68% dietary valine. Total solids production (p less than .05) and protein production (P less than .01) increased with increasing level of valine, and both were maximized at .68% dietary valine. Protein content also was maximized (P less than .01) at .68% dietary valine. Fecal (P less than .05) and urinary (P less than .01) nitrogen decreased with increasing valine, yielding greatest (P less than .01) nitrogen retention (excluding milk nitrogen) at .53% dietary valine. Because daily milk nitrogen production also increased (P less than .01) with increasing valine, there were no treatment differences (P greater than .05) in nitrogen balance (including milk nitrogen). Plasma valine concentration increased (P less than .01) gradually until .53% valine was fed, after which there was a rapid increase in concentration. Plasma isoleucine and leucine decreased (P less than .01) with increasing dietary valine. Plasma urea concentration was minimal (P less than .05) with .38% dietary valine. When all the criteria measured are considered, the lactating sow's requirement of valine is between .53 and .68%. The metabolic data support .53% dietary valine for the requirement, although the maximum response in production parameters at .68% dietary valine suggests that the requirement is above .53% dietary valine.