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Effects of calf- and yearling-fed beef production systems and growth promotants on production and profitability
Effects of calf- and yearling-fed beef production systems and growth promotants on production and profitabilityDownload
In each of 2 yr, 112 spring-born steers were used to evaluate the effect of calf-fed vs. yearling-fed with and without growth implant and β-adrenergic agonist on production parameters and economic potential. Steers were grouped into: (1) non-implanted feeders harvested at 11–14 mo of age, (2)...
Feeding value of peas for backgrounding beef heifers
Four diets in which peas progressively replaced barley [0% (0P), 30% (30P), 50% (50P), and 100% peas (100P)] and one in which canola meal (CM) replaced 10% of the barley, were fed to 90 beef heifers (initial weight 215.8 ± 13.8 kg). The heifers achieved average daily gains (ADGs) of 0.72, 0.80,...
Genetic parameters for production and feeding behaviour traits in crossbred steers fed a finishing diet at different ages
Genetic parameters for production and feeding behaviour traits in crossbred steers fed a finishing diet at different agesDownload
Because cattle can be raised postweaning under several feeding regimes, this study examined the consistency of phenotypic and genetic parameters of some production and feeding behaviour traits between two feeding periods that beef cattle received a finisher diet. Crossbred steers (n=851) were...
Greenhouse gas emissions from calf- and yearling-fed beef production systems, with and without the use of growth promotants
Greenhouse gas emissions from calf- and yearling-fed beef production systems, with and without the use of growth promotantsDownload
A spring calving herd consisting of about 350 beef cows, 14–16 breeding bulls, 60 replacement heifers and 112 steers were used to compare the whole-farm GHG emissions among calf-fed vs. yearling-fed production systems with and without growth implants. Carbon footprint ranged from 11.63 to 13.22...
Influence of canola oil on the fatty acid profiles in goat’s milk
Four Alpine does were used in a 4 × 4 Latin square design to determine the effects of feeding canola oil at four levels: 0, 2, 4 and 6% on milk fatty acid profile. The sum of C12:0 + C14:0 + C16:0(hypercholesterolemic fatty acids) decreased linearly and C18:0 + C18:1: C16:0 (indicator of...
Prediction of residual feed intake for first lactation dairy cows using orthogonal polynomial random regression
Prediction of residual feed intake for first lactation dairy cows using orthogonal polynomial random regressionDownload
Residual Feed Intake (RFI) is a measure of energy efficiency. Developing an appropriate model to predict expected energy intake while accounting for multifunctional energy requirements of metabolic body weight (MBW), empty body weight (EBW), milk production energy requirements (MPER), and their...
Residual metabolizable energy intake and its association with diet and test duration
The objective was to determine if end-of-test residual metabolizable energy intake (RMEI) is correlated with RMEI values calculated earlier in the test on steers fed two forage (silage) or four forage-grain diets. As the days on test increased the variation in RMEI decreased in all diets. In all...
Study of Carcass, organ, muscle, fat tissue weight and concentration in rats fed CLA or its precursors by Principal Component Analysis
Study of Carcass, organ, muscle, fat tissue weight and concentration in rats fed CLA or its precursors by Principal Component AnalysisDownload
Carcass, organ and muscle weight, and fat tissue data were obtained from 30 weaned male Wistar rats fed one of three diets, (10 rats/diet) over a period of 60 d. The diets were base with synthetic conjugated linoleic acid (CLA), sunflower oil or beef enriched CLA. The CLA diet contained the base...