Dietary treatments
A new batch of corn-soybean extruduct product was produced for the lactation performance study and proximate and lysine analysis of the corn-soybean extruded product used in Exp. 2 are shown in Table 1. The control diet, (CONTROL, n=18 sows), was formulated to represent a standard industry corn-soybean meal based lactation diet that met or exceeded NRC [10] nutrient recommendations for lactation sow (Table 3). the second diet (PRODUCT, n=15 sows) was comprised of the corn-soybean extruded product with the addition of vitamins and minerals to meet or exceeded NRC [10] recommendations (Table 3). This is a new diet being used in southwestern Minnesota. The third diet (OIL, n=18 sows), was formulated to be similar to that of CONTROL, with the addition of soybean oil to equal the lysine:Mcal Me ratio PRODUCT(Table 3). The reason the third diet was added was to be able to separate out a fat versus extrusion effect. Since the PRODUCT and OIL diets contained the same lysine:calorie ratio, if there was no difference between them, then the the effect was due to added fat. However,if there was a difference between the PRODUCT and OIL diets, then the effect could be attributed to extrusion. Due to bin space constraints, the diets were prepared in two batches with the first batch prepared eight days prior to the beginning of the experiment and the second batch prepansed and dispensed six days to weaning. Diet composition of both batches are shown in Table 4. Sows were provided diet allotments in morning and afternoon feedings by hand in a step-up manner to achieve ad-libitum feed intake. Sows were splitrationed 1.4 kg daily rations at the start of the experiment;feed additions were increased in 0.45 kg increments at each feeding if no orts were collected. Feed additions were weighed and recorded daiy.
Dietary treatmentsA new batch of corn-soybean extruduct product was produced for the lactation performance study and proximate and lysine analysis of the corn-soybean extruded product used in Exp. 2 are shown in Table 1. The control diet, (CONTROL, n=18 sows), was formulated to represent a standard industry corn-soybean meal based lactation diet that met or exceeded NRC [10] nutrient recommendations for lactation sow (Table 3). the second diet (PRODUCT, n=15 sows) was comprised of the corn-soybean extruded product with the addition of vitamins and minerals to meet or exceeded NRC [10] recommendations (Table 3). This is a new diet being used in southwestern Minnesota. The third diet (OIL, n=18 sows), was formulated to be similar to that of CONTROL, with the addition of soybean oil to equal the lysine:Mcal Me ratio PRODUCT(Table 3). The reason the third diet was added was to be able to separate out a fat versus extrusion effect. Since the PRODUCT and OIL diets contained the same lysine:calorie ratio, if there was no difference between them, then the the effect was due to added fat. However,if there was a difference between the PRODUCT and OIL diets, then the effect could be attributed to extrusion. Due to bin space constraints, the diets were prepared in two batches with the first batch prepared eight days prior to the beginning of the experiment and the second batch prepansed and dispensed six days to weaning. Diet composition of both batches are shown in Table 4. Sows were provided diet allotments in morning and afternoon feedings by hand in a step-up manner to achieve ad-libitum feed intake. Sows were splitrationed 1.4 kg daily rations at the start of the experiment;feed additions were increased in 0.45 kg increments at each feeding if no orts were collected. Feed additions were weighed and recorded daiy.
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