Toxicological Feeding Trials to Evaluate the Hazard of Secondary Poisoning to Gopher Snakes, Pituophis catenifer

Copeia ◽  
1965 ◽  
Vol 1965 (2) ◽  
pp. 244 ◽  
Author(s):  
Elbert M. Brock
Keyword(s):  
Secondary Poisoning ◽  
Feeding Trials

scholarly journals 146 Survey of residual feed intake in Katahdin and Texel lambs in a feedlot environment

2020 ◽  
Vol 98 (Supplement_2) ◽  
pp. 75-76
Author(s):  
Camren l Maierle ◽  
Andrew R Weaver ◽  
Eugene Felton ◽  
Scott P Greiner ◽  
Scott A Bowdridge
Keyword(s):  
Feed Intake ◽  
Feed Efficiency ◽  
Large Scale ◽  
Residual Feed Intake ◽  
Production Traits ◽  
Meaningful Improvement ◽  
Average Intake ◽  
Test Population ◽  
Feeding Trials ◽  
Genetic Evaluations

Abstract Residual feed intake (RFI) is quickly becoming the preferred measurement of efficiency in many species due to its inherent independence of most other important production traits. Making meaningful improvement in feed efficiency of sheep will require a consistent methodology to accurately identify efficient individuals. Due to difficulty in measuring this trait efforts must be made to incorporate efficiency data in large-scale genetic evaluations. The aim of this study was to evaluate lambs in a feedlot with large-scale genetic evaluations for feed efficiency calculated by residual feed intake (RFI) utilizing a Growsafe™ system. RFI was calculated by subtracting expected intake from actual intake. Expected intake was determined by regressing metabolic body size of mid-test weight. Regression determined ADG on actual intake for individuals in the population. Texel (n = 58) and Katahdin (n = 118) lambs were placed in a feedlot and fed in separate feeding trials, a complete pellet ad libitum as the sole source of nutrition. In this environment Texel and Katahdin lambs had expected ADG values (0.27 kg/day, 0.32 kg/day respectively) and actual intake data (2154.17 g/day, 1909.33 g/day respectively. After a period of adaptation, Texel average intake was determined over a period of 27 consecutive days and used to calculate individual RFI within the test population. Observable ranges of RFI (-0.62 – +0.62) were seen in the Texel lambs. At the start of the Katahdin trial lambs were separated by sex and FEC treatment. After a period of adaptation, Katahdin average intake was determined over a period of 42 consecutive days and used to calculate individual RFI within the test population. Observable ranges of RFI (-0.53 – +0.50) were seen in the Katahdin lambs as well. In both feeding trials RFI appeared to be normally distributed. Use of this technology may be useful in identifying superior individuals for feed efficiency.

Forage brassica: a feed to mitigate enteric methane emissions?

2016 ◽  
Vol 56 (3) ◽  
pp. 451 ◽  
Author(s):  
Xuezhao Sun ◽  
David Pacheco ◽  
Dongwen Luo
Keyword(s):  
Methane Emissions ◽  
Methane Yield ◽  
Forage Crops ◽  
Enteric Methane ◽  
Winter Crop ◽  
Feeding Trials ◽  
Series Of Experiments ◽  
Forage Rape ◽  
Pastoral Farming ◽  
Enteric Methane Emissions

A series of experiments was conducted in New Zealand to evaluate the potential of forage brassicas for mitigation of enteric methane emissions. Experiments involved sheep and cattle fed winter and summer varieties of brassica forage crops. In the sheep-feeding trials, it was demonstrated that several species of forage brassicas can result, to a varying degree, in a lower methane yield (g methane per kg of DM intake) than does ryegrass pasture. Pure forage rape fed as a winter crop resulted in 37% lower methane yields than did pasture. Increasing the proportion of forage rape in the diet of sheep fed pasture linearly decreased methane yield. Feeding forage rape to cattle also resulted in 44% lower methane yield than did feeding pasture. In conclusion, reductions in methane emission are achievable by feeding forage brassicas, especially winter forage rape, to sheep and cattle. Investigating other aspects of these crops is warranted to establish their value as a viable mitigation tool in pastoral farming.

Impact of Diet on Metabolism and Swimming Performance in Juvenile Lake Trout, Salvelinus namaycush

1989 ◽  
Vol 46 (3) ◽  
pp. 384-388 ◽  
Author(s):  
F. W. H. Beamish ◽  
J. C. Howlett ◽  
T. E. Medland
Keyword(s):  
Oxygen Consumption ◽  
Swimming Speed ◽  
Lake Trout ◽  
Swimming Performance ◽  
Salvelinus Namaycush ◽  
Feeding Trial ◽  
Direct Association ◽  
Feeding Trials ◽  
Velocity Increments ◽  
Isocaloric Diets

Juvenile lake trout, Salvelinus namaycush, of similar size were fed one of three isocaloric diets, each differing in protein and lipid content. Oxygen consumption and swimming performance were measured in a recirculating water flume at intervals throughout the 70-d feeding trials (10 °C). Swimming speed was increased by stepwise velocity increments (5 cm∙s−1) and oxygen consumption was measured at each velocity between 20 and 45 cm∙s−1. Oxygen consumption for a given speed did not differ significantly throughout the feeding trial nor among the diets implying a similarity in the quality and quantity of substrate catabolized for energy. Basal metabolism (0 cm∙s−1) was also independent of diet and feeding interval. Critical swimming speed increased with dietary and carcass protein content to suggest a direct association with muscle mass and number of myofilaments.

Can stealing cows distort the results of feeding trials? An experiment for quantification and prevention of stealing feed by dairy cows from roughage intake control feeders

2014 ◽  
Vol 159 ◽  
pp. 1-8 ◽  
Author(s):  
Salla Ruuska ◽  
Wilhelmiina Hämäläinen ◽  
Auvo Sairanen ◽  
Elina Juutinen ◽  
Leena Tuomisto ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Feeding Trials ◽  
Intake Control

EFFECT OF COMPOSITION AND PROCESSING OF DIETS ON PERFORMANCE OF HOLSTEIN STEERS

1968 ◽  
Vol 48 (3) ◽  
pp. 263-267
Author(s):  
D. A. Christensen ◽  
B. A. Duck ◽  
H. H. Nicholson
Keyword(s):  
Vitamin E ◽  
Feed Efficiency ◽  
Crude Protein ◽  
Basal Diet ◽  
Initial Weight ◽  
Manganese Zinc ◽  
Physical Form ◽  
Feeding Trials ◽  
Pelleted Diet ◽  
Improve Rate

Feeding trials involving a total of 78 Holstein steers and utilizing barley diets were conducted to determine the effects of vitamin E and trace minerals, hay, diethylstilbestrol, and physical form of the barley on rate of gain, feed efficiency and carcass characteristics.In the first trial, a basal diet containing 13.2% crude protein was used. Inclusion of a vitamin E, manganese, zinc, copper and sulfur supplement, 10% hay, or urea in the pelleted diets, or implantation with 9 mg of diethylstilbestrol at the initial weight of 92 kg did not improve rate of gain or dressing percent (P < 0.05). The inclusion of 10% hay reduced feed efficiency (P < 0.05).In the second trial in which dry-rolled, steam-rolled, dry-rolled and pelleted, and steam-rolled and pelleted barley diets were fed, the dry-rolled diet gave slower gains than the diets containing steam-rolled barley or steam-rolled, pelleted barley (P < 0.05). Implanting steers fed the steam-rolled, pelleted diet with 24 mg of diethylstilbestrol at 240 kg liveweight increased rate of gain over other treatments (P < 0.05). Treatments did not affect feed efficiency. Dressing percent was increased in steers fed steam-rolled barley in comparison with those fed dry-rolled barley.

Probable Error in Pig-Feeding Trials

1915 ◽  
Vol 7 (2) ◽  
pp. 137-141
Author(s):  
Charles Crowther
Keyword(s):  
Statistical Analysis ◽  
Live Weight ◽  
Probable Error ◽  
Weight Increase ◽  
Feeding Experiment ◽  
Feeding Experiments ◽  
Feeding Trials

In an earlier issue of this Journal, Robinson and Halnan have communicated the results of a statistical analysis of three sets of pig-feeding experiments from which they conclude that “the probable error of one animal in a pig-feeding experiment is in the region of 10 per cent, of the average live-weight increase.”

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