Livestock Industries Innovation

South Perth, Australia

Livestock Industries Innovation

South Perth, Australia
SEARCH FILTERS
Time filter
Source Type

Moore K.L.,Livestock Industries Innovation | Mullan B.P.,Livestock Industries Innovation | Campbell R.G.,Pork Cooperative Research Center Ltd | Kim J.C.,Livestock Industries Innovation
Animal Production Science | Year: 2013

Two experiments were conducted to determine the responses of entire male and female pigs of the Australian Pig Improvement Co. genotype to dietary lysine. In Experiment 1, a total of 350 [Large White (Landrace Duroc)] entire male and female pigs weighing 22.3 0.16 kg (mean s.e.m.) were used in a 2 by 5 factorial design with the main treatments being sex (entire males and females) and five levels of standardised ileal digestible (SID) lysine to digestible energy ratio (0.6, 0.7, 0.8, 0.9 and 1.0 g SID lysine/MJ DE). In Experiment 2, a total of 420 [Large White (Landrace Duroc)] entire male and female pigs weighing 49.6 0.34 kg (mean s.e.m.) were used in a 2 by 5 factorial design with the main treatments being sex (entire males and females) and five levels of SID lysine to MJ DE ratio (0.4, 0.5, 0.6, 0.7 and 0.8 g). From 20 to 50 kg liveweight (LW), entire males had a similar average daily gain (ADG), lower feed intake (FI, P 0.001) and better feed to gain ratio (F:G, P 0.001) compared with females. From 50 to 100 kg LW, entire males had a higher ADG (P 0.001), similar FI and improved F:G ratio (P 0.001) compared with females. Data were subjected to the quadratic response model to determine optimum SID lysine requirement for maximum ADG and minimum F:G for the weight ranges 20-35, 35-50, 50-65, 65-80, and 80 to 95 kg LW. For male pigs, maximum ADG was achieved at SID lysine levels of 1.00, 0.87, 0.72, 0.67 and 0.63 g/MJ DE, respectively. Minimum F:G was achieved at SID lysine levels of 1.00, 0.87, 0.80, 0.69 and 0.63 g/MJ DE for the respective weight ranges. For female pigs, maximum ADG was achieved at SID lysine levels of 0.90, 0.84, 0.67, 0.63 and 0.58 g/MJ DE. Minimum F:G for females was achieved at SID lysine levels of 0.86, 0.85, 0.64, 0.66 and 0.40 g/MJ DE for the respective weight ranges. The results suggest that this Australian genotype requires greater dietary SID lysine in the growing and finishing phase than the levels currently used by the Australian industry.


Moore K.L.,Livestock Industries Innovation | Mullan B.P.,Livestock Industries Innovation | Kim J.C.,Livestock Industries Innovation
Animal Production Science | Year: 2013

A completely randomised block experiment was conducted using 216 female pigs (Large White Landrace, six pigs/pen and 12 replicate pens/treatment), at an average liveweight (LW) of 22.6 kg 0.56 (mean s.e.m.), to examine the effect of feeding strategies on performance during the grower-finisher phase. Pigs were blocked and randomly allocated to the following treatments on the basis of initial LW: (1) phase-feeding: diets changed when the average LW of pigs in the pen reached 20, 50 or 80 kg; (2) blend: diets changed weekly to meet the requirements of the average LW of pigs in the pen and; (3) single: the same diet fed throughout (formulated to meet the requirements of the pig at 60 kg LW). The experimental diets were fed from 22 to 102 kg LW. Between 68 and 98 days of age, pigs fed the single diet grew more slowly (P 0.001) due to poorer feed conversion (P 0.001) than did pigs fed the phase-feeding or blend diets. However, between 99 and 133 days of age, pigs fed the single diet utilised feed more efficiently (P 0.001) than did pigs fed the phase-feeding and blend diets. Therefore, there was no significant effect of the feeding strategies on overall growth performance (P 0.05) and there was no significant difference in carcass quality (P 0.05) among treatment groups. However, it was 3.74% and 3.51% cheaper to use the blend- and single-diet feeding strategies, respectively, than it was to use a phase-feeding program (P ≤ 0.002). The present experiment has shown that blend-feeding could be a strategy to reduce the cost of production. Feeding a single diet appears to have merit and may have appeal for certain circumstances; however, it would need to be investigated further before being implemented commercially.

Loading Livestock Industries Innovation collaborators
Loading Livestock Industries Innovation collaborators