Vlijanie urovnja belka i potreblenija ehnergii na suporosnye svinomatki

Через III дней 39 супоросных свиноматок кормили смесями содержащими 12 или 14,7% переваримого белка. Суточный рацион был 1,5; 2,0; 2,5 или 3,5 кг групп получающих смесь с 12% белка, и 3,5 кг для группы с 14,7% белка. Девять холостых свиноматок кормлено 2,5 кг/сутки смесью с 12% белка. Химический состав тела нетто определили на 28 свиноматках в начале опыта и на всех свиноматках по оконьчании опыта. Суточные привесы тела, белка и жира у супоросных свиноматок увеличивались пропорционально к увеличению рационов (P < 0,01). Различие в суточных привесах тела и белка между супоросными и холостыми свиноматками зависило только от матки и её содержимого. Потребление бытовое энергии супоросных свиноматок было 490,6 kJ/кг 0.75, стоимость отложения белка было 54,3 kJ/г, а жира 57,3 kJ/г.During 111 days of gravidity 39 gilts were fed diets containing 12.0 or 14.7% digestible protein. Feed intake was 1.5, 2.0, 2.5 or 3.5 kg of 12% and 3.5 kg of 14.7% protein diets per day. Nine non-gravid gilts uere fed 2.5 kg 12% protein diet per day. Body net chemical composition was determined on 28 gilts at the start of experiment and on all experimental animals at the end. Body mass, protein and fat gain in gravid gilts increased proportionately to the increase of feed consumption (P < 0.01). Differences in body mass and protein gain between gravid and non-gravid gilts were entirely connected with uterus and ita content. Daily maintenance requirement of gravid gilta was 490.6 kJ/kg 0.75 cost of protein deposition was 54.3 and fat 57.3 kJ/g

Available phosphorus in diets for 15 to 30 kg pigs genetically selected for meat deposition

With the objective to evaluate the effect of dietary available phosphorus levels (aP) on the performance, blood and bone parameters of castrated male and female pigs, genetically selected for meat deposition, 60 commercial hybrids pigs with initial weight of 15.54±0.68 kg were allotted in a completely randomized block design, with six treatments (0.103, 0.210, 0.317, 0.424, 0.531, and 0.638% aP), five replicates, and two animals per experimental unit. Pigs were fed ad libitum and water was provided until the end of the experimental period (21 days), when animals reached 31.31±2.94 kg. Daily weight gain and daily feed intake increased, while the feed conversion improved quadratically up to 0.534, 0.487, and 0.574% aP maximum responses, respectively. The aP intake and the values of inorganic phosphorus in serum increased linearly with increasing the levels of aP in the diets. Alkaline phosphatase activity increased quadratically up to 0.558% maximum response. Bone breaking strength and calcium, phosphorus, and ash contents in the bones increased linearly with increasing aP concentration in the diets. The available phosphorus requirement of castrated male and female pigs genetically selected for meat deposition from 15 to 30 kg for best results of performance is 0.574%, corresponding to a daily intake of 8.26 g of available phosphorus