Index Selection and Feed Intake Restriction in Swine. II. Effect on Energy Utilization
نویسندگان
چکیده
منابع مشابه
Bayesian analysis of the effect of selection for residual feed intake on growth and feed intake curves in Yorkshire swine.
Gompertz growth functions were fitted to longitudinal measurements of daily feed intake (DFI) and BW of 586 boars and 495 gilts from a selection experiment in Yorkshire pigs for residual feed intake (RFI). The selection experiment consists of a line selected for low residual feed intake (LRFI) for 5 generations and a randomly selected control line (CTRL). The objectives of this study were to us...
متن کاملFeed Intake Behavior and Implications for Energy Utilization
The study of feed intake has been greatly facilitated by the recent development of computerized systems that monitor the feed intake of individual animals within a group. Such equipment was originally designed for use by breeding stock supply organizations in the performance testing of pigs in group situations. The majority of selection programs for pigs place considerable emphasis on feed effi...
متن کاملEffects of feed restriction and subsequent refeeding on energy utilization in growing pigs.
An experiment was carried out to evaluate the metabolic utilization of energy in crossbred barrows during feed restriction and subsequent refeeding. Ten pigs, initially weighing 52 kg, were used in 5 blocks of 2 littermates each. A 7-d adaptation period (P1) was used in which pigs were offered feed at 2.60 MJ of ME.kg of BW(-0.60).d(-1). This adaptation period was followed by a 7-d period (P2),...
متن کاملSelection response and genetic parameters for residual feed intake in Yorkshire swine.
Residual feed intake (RFI) is a measure of feed efficiency defined as the difference between the observed feed intake and that predicted from the average requirements for growth and maintenance. The objective of this study was to evaluate the response in a selection experiment consisting of a line selected for low RFI and a random control line and to estimate the genetic parameters for RFI and ...
متن کاملEffect of qualitative feed restriction on energy metabolism and nitrogen retention in sheep
Periodic restrictions in feed quality and quantity is an important phenomenon in regions where animal production should bridge the gap between periods of forage production separated by a dry season. Eighteen Swifter male lambs, weaned at the age of ca. three months, were used to quantify effects of feed quality restriction and realimentation on changes in energy and nitrogen metabolism. The die...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 1983
ISSN: 0021-8812,1525-3163
DOI: 10.2527/jas1983.563570x