Diet selection priorities in growing pigs offered a choice of feeds
نویسندگان
چکیده
Two experiments were conducted to test whether young pigs are capable of discriminating against a feed based on its nutrient balance (or protein value) and/or the presence or absence of anti-nutritional factors, and whether there is an order of preference. In each experiment 48 Large White x Landrace female pigs weighing 16.5±1.50 kg were randomly allocated to one of either 12 dietary treatments (Experiment 1) or 14 dietary treatments (Experiment 2) and kept on the treatment diets for four weeks. In Experiment 1 there were four single feed control treatments, four two-feed choice treatments and four three-feed treatments. The choices were between soyabean oilcake vs. cottonseed oilcake as the main dietary protein source, and between diets that have a higher (balanced) versus lower (unbalanced) proportion of amino acids compared with the balance of amino acids in ideal protein. Experiment 2 had similar choices to Experiment 1, but also included treatments with 1% added tannin. The results showed that when young pigs were given a choice of diets their preference was firstly against potentially harmful substances in the feed (e.g. tannin) or an anti-nutritive factor (e.g. cottonseed oilcake), and then for better-balanced or higher protein-value feeds.
منابع مشابه
Diet selection in sheep: the role of the rumen environment in the selection of a diet from two feeds that differ in their energy density.
The effect of the energy density (ED) of feeds offered as a choice on the diet selection of sheep, and the relationship between the rumen environment and the diet selected from feeds of different ED were investigated in two experiments. In the first experiment two feeds, L and H, and their mixture M (3:1 w/w) were formulated. All feeds had similar calculated metabolizable protein:metabolizable ...
متن کاملSelf-selection by growing pigs of diets differing in lysine content.
Two 42-d experiments were conducted with 60 and 100 Large White growing pigs, initially weighing 17.7 and 18.3 kg, respectively, to determine their ability to select between diets varying in lysine content. Dietary lysine levels ranged from .60 to 1.40%. A common basal diet (17% crude protein, 3.3 Mcal digestible energy/kg) based on corn, soybean meal and peanut meal was used in both experiment...
متن کاملThe ability of laying hens to regulate phosphorus intake when offered two feeds containing different levels of phosphorus.
The ability of laying hens to adjust their intake of available P (AP) was investigated with a maize-soyabean diet fed to forty-eight individually caged birds in a 2 x 4 factorial experiment. From 19 to 25 weeks of age (phase 1) twenty-four birds were fed a normal-P (NP) diet (2.2 g AP/kg DM) and twenty-four were fed a low-P (LP) diet (1.1 g AP/kg). LP eggs were lighter (51 v. 54 (SEM 1.0) g; P<...
متن کاملSelf-selection of lysine by growing pigs: choice combinations between deficient or suboptimal and adequate or superoptimal dietary levels according to sex.
Self-selection of dietary lysine was studied in one 42-d experiment involving 100 Large White growing pigs, with an equal number of females and castrated males, initially weighing 17.7 kg, within 5 treatments of 20 animals in each. A common basal diet (17% CP, 13.8 MJ DE/kg) based on maize, soybean meal and peanut meal, and containing a deficient level of lysine (0.61%), was used. Supplementary...
متن کاملThe effects of physical form of feed, carbohydrate source, and inclusion of sodium bicarbonate on the diet selections of sheep.
We proposed an hypothesis that ruminants attempt to select a diet that promotes high levels of feed intake by maintaining optimal ruminal conditions. Three tests of the hypothesis considered whether the diet selection of sheep given either a choice of two high energy density (ED) feeds or a choice between a high and a low ED feed is affected by 1) sodium bicarbonate inclusion (NaHCO3; 1, 2, and...
متن کامل