Processing is generally employed to alter the physical and chemical properties of feeds used in pig diets, using hammer/roller mills, pellet mills and extruders/expanders. The reported optimum particle sizes of corn are approximately $500{\mu}m$, $500-700{\mu}m$, $400-600{\mu}m$, for nursery, growing-finishing, and breeder pigs respectively. Optimum particle size of grains are affected by diet complexity. There was a trend towards reducing particle size in order to increase ADG in pigs fed a simple diet, though such was not the case for pigs fed a complex diet. Uniformity of particle size also affects the nutritional values of swine feeds. Uniform particle sizes would consistently give greater nutrient digestibilities. In terms of pellet quality, it is reported that a higher incidence of fmes in pelleted feeds has a direct correlation with poorer feed conversion ratio in pigs. Particle and pellet sizes are also very important for pelleting in terms of grinding, digestibility, stomach ulceration and pellet durability. A particle size of $600{\mu}m$, or slightly less, seemed optimal for com in fmishing pigs, and the 5/32 in. diameter pellets supported the best efficiencies of gain during nursery and finishing phases. Extruder and/or expander processes would allow the feed industry an increased flexibility to utilize a wider spectrum of feed ingredients, and improve pellet quality of finished feeds. It would appear that extruded or expanded diets containing highly digestible ingredients have little effect on the growth performance of pigs, and the feeding values of the feeds over pelleted diets were not improved as pigs grew. The extruder or expander is much more effective than a pelletizer in salmonella control. Gastric ulcerations and/or keratinizations were consistently reported in pigs fed mash and processed diets containing finely ground grains, whereas carcass quality was not affected by diet processing methods such as pelleting, extruding or expanding. In corn- or sorghum-based diets, the electrical energy consumption is 4-5 times higher in the expanding than in the pelleting process. But the expander's processing cost was half of that shown by an extruder. Finally, the decision of which feed processing technology to adopt would depend on the processing cost, and any potential improvement in growth performance and digestibilities of nutrients should offset the increased operating and capital costs related to the extruder/expander technology over mash or pelleting processes in pigs.
Objective: This study was conducted to evaluate various levels of milk by-product in weaning pig diet on growth performance, blood profiles, carcass characteristics and economic performance for weaning to finishing pigs. Methods: A total of 160 weaning pigs ([Yorkshire${\times}$Landrace]${\times}$Duroc), average $7.01{\pm}1.32kg$ body weight (BW), were allotted to four treatments by BW and sex in 10 replications with 4 pigs per pen in a randomized complete block design. Pigs were fed each treatment diet with various levels of milk by-product (Phase 1: 0%, 10%, 20%, and 30%, Phase 2: 0%, 5%, 10%, and 15%, respectively). During weaning period (0 to 5 week), weaning pigs were fed experimental diets and all pigs were fed the same commercial feed during growing-finishing period (6 to 14 week). Results: In the growth trial, BW, average daily gain (ADG), and average daily feed intake (ADFI) in the nursery period (5 weeks) increased as the milk by-product level in the diet increased (linear, p<0.05). Linear increases of pig BW with increasing the milk product levels were observed until late growing period (linear, p = 0.01). However, there were no significant differences in BW at the finishing periods, ADG, ADFI, and gain:feed ratio during the entire growing-finishing periods. The blood urea nitrogen concentration had no significant difference among dietary treatments. High inclusion level of milk by-product in weaner diet decreased crude protein (quadratic, p = 0.05) and crude ash (Linear, p = 0.05) of Longissimus muscle. In addition, cooking loss and water holding capacity increased with increasing milk product levels in the weaner diets (linear, p<0.01; p = 0.05). High milk by-product treatment had higher feed cost per weight gain compared to non-milk by-products treatment (linear, p = 0.01). Conclusion: Supplementation of 10% to 5% milk by-products in weaning pig diet had results equivalent to the 30% to 15% milk treatment and 0% milk by-product supplementation in the diet had no negative influence on growth performance of finishing pigs.
The objective of this study was to investigate the effect of dietary supplementation with thiazolidinedione (TZD) on growth performance and meat quality of finishing pigs. In Experiment 1, 80 castrated finishing pigs (Large White${\times}$Landrace, BW = 54.34 kg) were randomly assigned to 2 treatments with 5 replicates of 8 pigs each. The experimental pigs in the 2 groups were respectively fed with a diet with or without a TZD supplementation (15 mg/kg). In Experiment 2, 80 castrated finishing pigs (Large White${\times}$Landrace, BW = 71.46 kg) were divided into 2 treatments as designed in Experiment 1, moreover, carcass evaluations were performed. The results from Experiment 1 showed that TZD supplementation could significantly decreased the average daily feed intake (ADFI) (p<0.05) during 0 to 28 d, without impairing the average daily gain (ADG) (p>0.05). In Experiment 2, the ADG was significantly increased by TZD supplementation during 14 to 28 d and 0 to 28 d (p<0.05) and the feed:gain ratio (F:G) was significantly decreased by TZD supplementation during 0 to 28 d (p<0.05). Compared with the control group, TZD group had significantly higher serum triglyceride (TG) concentration at 28h and serum high-density lipoprotein (HDL) levels at 14 d (p<0.05). Moreover, there was an apparent improvement in the marbling score (p<0.10) and intramuscular fat (IMF) content (p<0.10) of the longissimus dorsi muscle in pigs treated by TZD supplementation. Real-time RT-PCR analyses demonstrated that pigs of TZD group had higher mRNA abundance of $PPAR{\gamma}$ coactivator 1 (PGC-1) (p<0.05) and fatty acid-binding protein 3 (FABP3) (p<0.05) than pigs of control group. Taken together, these results suggested that dietary TZD supplementation could improve growth performance and increase the IMF content of finishing pigs through regulating the serum parameters and genes mRNA abundance involved in fat metabolism.
This experiment was conducted to investigate the effect of dietary supplementation of the black soldier fly (bsf) larvae on growth performance, carcass rate, and fatty acid profile of chicken meat in broiler chicks. Four hundred eighty 1-d-old broilers (Ross 308) were distributed into 3 treatments with 4 pens at 30 birds per replicate. Treatments were corn-soybean meal based broiler diet (control) and the basal diet replaced with bsf at the level of 3 and 6% respectively. Viability was not different significantly. Body weight gain was higher in control than other treatments. Feed intake was not statistically different of treatments. Feed conversion ratio was lower in control than other treatments. Relative weight of breast meat was significantly increased in all treated groups than in control. But, another relative weights of chicken meat cuts (thigh, wing, neck, back) were not significantly different among the groups. In conclusion, it could be suggested that dietary supplementation of black soldier flylarvae could beneficially improved the performance on broiler.
The present study furthered this research by determining the optimal level of inuloprebiotics derived from Korean Jerusalem artichoke to promote growth in broiler chickens. On hatch day, 320 male Ross 308 broilers were randomly allotted to four groups for a 35-day feeding regimen. The groups were a control (no supplementation), diet supplementation with antibiotics (8 ppm avilamycin), supplementation with 200 ppm inuloprebiotics, and supplementation with 250 ppm inuloprebiotics. Body weight and feed intake were comparably high in the two inuloprebiotics groups, and exceeded the values for the control and antibiotics groups. Body weight and feed intake was higher in chickens fed the antibiotics supplemented diet, compared to controls. There were significant differences among treatment groups. Feed conversion ratio during total experimental periods was significantly high in the control group compared to the inuloprebiotics-fed groups, but no significant difference was evident using antibiotics or inuloprebiotics dietary supplementation. Carcass weight, dressing percentage, and weight of breast and thigh muscle were significantly higher for inuloprebiotics-fed chickens, compared with control and antibiotic-fed chickens. Inuloprebiotics concentration was not significant, while antibiotics-fed chickens displayed significantly higher values than control chickens. Abdominal fat was significantly reduced (19.08%-23.30%) and blood immunoglobulin and the weight of the thymus and Bursa of Fabricius were significantly increased in chickens receiving inuloprebiotics-supplemented feed, compared to control and antibiotics fed groups. In the lower intestine, the viable counts of beneficial bacteria (Bifidobacteria and Lactobacillus) were significantly increased and counts of harmful bacteria (Escherichia coli and Salmonella sp.) were significantly decreased in the presence of the inuloprebiotics, compared to control and antibiotic. The present results support 200 ppm as an optimal level of Korean Jerusalem artichoke-derived inuloprebiotics as a dietary supplement to improve growth in broiler chickens.
Cho, S.K.;Kim, H.I.;Lee, M.K.;Lee, J.J.;Kwak, Y.C.;Lee, S.C.;Lee, Y.
Korean Journal of Poultry Science
/
v.36
no.3
/
pp.215-222
/
2009
The objective of this study was to evaluate the effects of dietary Solanum nigrum L. (SNL) and Glycyrrhiza uralensis Fisch (GUF) mixture powder on performance and blood compositions of broilers. Seven-day old Ross broiler male chickens were randomly given into one of the 5 dietary treatments for 5 weeks: 1) no SNL-GUF and antibiotics (control); 2) 5 ppm avilamycin (T1); 3) 0.5% SNL and GUF (T2); 4) 1.0% SNL and GUF (T3); and 5) 2.0% SNL and GUF (T4). Each dietary group (n = 10) had three replicates. Body weight gain, feed intake and feed conversion ratio of broiler chickens were not significantly different among treatments. Carcass weight was highest at both 4 (P<0.05) and 6 weeks (P>0.05) in the treatment with 1.0% SNL and GUF. Liver, but not Spleen, weights at both 4 and 6 weeks were significantly higher in the treatments with 0.5% SNL and GUF treatment (P<0.05). The contents of protein, albumin, bilirubin, glutamic-oxaloacetic transaminase (GOT), glutamic-pyruvic transaminase (GPT), glucose, triglyceride (TG) and cholesterol in blood serum at the 4weeks and 6 weeks were not significantly influenced. These results suggest that addition of SNL and GUF could be use a substitutes for antibiotics since they did not influence to the productivity and the blood composition of the broilers.
Gene expression profiling has offered new insights into postmortem molecular changes associated with meat quality. To acquire reliable transcript quantification, high quality RNA is required. The objective of this study was to analyze integrity of RNA isolated from chicken skeletal muscle (pectoralis major) and its capability of serving as the template in quantitative real-time polymerase chain reaction (qPCR) as a function of postmortem intervals representing the end-points of evisceration, carcass chilling and aging stages in chicken abattoirs. Chicken breast muscle was dissected from the carcasses (n = 6) immediately after evisceration, and one-third of each sample was instantly snap-frozen and labeled as 20 min postmortem. The remaining muscle was stored on ice until the next rounds of sample collection (1.5 h and 6 h postmortem). The delayed postmortem duration did not significantly affect $A_{260}/A_{280}$ and $A_{260}/A_{230}$ ($p{\geq}0.05$), suggesting no altered purity of total RNA. Apart from a slight decrease in the 28s:18s ribosomal RNA ratio in 1.5 h samples (p<0.05), the value was not statistically different between 20 min and 6 h samples ($p{\geq}0.05$), indicating intact total RNA up to 6 h. Abundance of reference genes encoding beta-actin (ACTB), glyceraldehyde 3-phosphate dehydrogenase (GAPDH), hypoxanthine-guanine phosphoribosyltransferase (HPRT), peptidylprolylisomerase A (PPIA) and TATA box-binding protein (TBP) as well as meat-quality associated genes (insulin-like growth factor 1 (IGF1), pyruvate dehydrogenase kinase isozyme 4 (PDK4), and peroxisome proliferator-activated receptor delta (PPARD) were investigated using qPCR. Transcript abundances of ACTB, GAPDH, HPRT, and PPIA were significantly different among all postmortem time points (p<0.05). Transcript levels of PDK4 and PPARD were significantly reduced in the 6 h samples (p<0.05). The findings suggest an adverse effect of a prolonged postmortem duration on reliability of transcript quantification in chicken skeletal muscle. For the best RNA quality, chicken skeletal muscle should be immediately collected after evisceration or within 20 min postmortem, and rapidly preserved by deep freezing.
Two experiments were conducted to evaluate the feeding value of rancid rice bran in finishing pigs. In exp. 1, fresh (FRB), rancid (RRB), pelleted and extruded rice bran were used to determine stability and nutrient digestibility. The free fatty acid (FFA) values of FRB and RRB were 8.2 and 15.3%, respectively. Some of the FRB was pelleted ($70^{\circ}C$) or extruded ($110^{\circ}C$). In exp. 2, a total of 48 pigs ($Landrace{\times}Yorkshire{\times}Duroc$, $51.12{\times}0.5kg$) were employed for a 56-d feeding trial with 3 treatments: Control (defatted rice bran+animal fat), 20% FRB (8.2% FFA), and 20% RRB (15.6% FFA). There was a significant difference (p<0.05) in FFA% between raw and pelleted, and extruded rice bran on d 10 after storage. On d 30 the extruded rice bran showed lower (p<0.05) FFA% than the pelleted one. Dry matter digestibility was higher (p<0.05) in processed rice brans (pelleted or extruded) than raw rice bran (FRB or RRB). Energy and protein digestibilities in extruded rice bran were higher (p<0.05) than those in raw rice brans. The digestibilities of isoleucine, leucine and phenylalanine were lower (p<0.05) in RRB than FRB. Pigs fed diets containing FRB grew faster (p<0.05) and showed better feed conversion ratio (p<0.05) than those fed diets containing defatted rice bran or RRB. Carcass characteristics including dressing percentage and backfat thickness were not affected (p>0.05) by dietary treatments. With increasing storage time, the raw pork from RRB showed higher (p<0.05) thiobarbituric acid reactive substance (TBARS) and peroxide value (POV) than those from FRB when stored at $1^{\circ}C$ for 3 weeks. Cooked pork showed rapid increase in TBARS and POV as compared to raw pork regardless of rice bran rancidity. As the storage time passed, Lightness (L) was lower (p<0.05) in RRB than FRB. Redness (a) was higher (p<0.05) in control than rice bran groups when stored 2-3 weeks. However, there was no difference (p>0.05) in redness (a) between the two rice bran groups. In conclusion, feeding rancid rice bran gave negative effects on growth performance and pork quality in finishing pigs.
Cho Yong-Il;Hur Tai-Young;Kang Seog-Jin;Suh Guk-Hyun;Ko Moon-Suck;Kim Kyung-Hun;Na Ki-Jeong;Kim Ill-Hwa
Journal of Veterinary Clinics
/
v.22
no.4
/
pp.357-364
/
2005
We surveyed the incidence of urinary calculi for feeding period, urinary lesion, composition of calculi and changes of serum chemistry with Korean native castrated steers, which are growing until 26 through 31 months. Without showing any clinical signs such as urethral obstruction, hydronephrosis and strangury for all group, $37.8\%$ (34 out of 90) of Korean native steers carried urinary calculi in carcass. The incidence of urine calculi far different feeding stages from 26 to 31 months were observed as $13.3-60.0\%$er, no significant differences were detected. The distribution of calculi were kidney $(24.4\%)$, kidney and bladder $(10\%)$ and kidney, bladder and urine $(3.3\%)$. Congestion of urinary bladder was shown in $26.6\%$ of Korean native steers. Korean native steers with urinary calculi $(41.2\%)$ had more possibilities (P<0.05) to bring outbreaks of congestion of urinary bladder than those of without calculi $(17.8\%)$. The main composition of calculi were struvite (magnesium ammonium phosphate crystals), calcium phosphate, calcium carbonate, calcium oxalate, non-oxalate calcium, ammonia and phosphate. The distribution of urine pH was $71.7\%$(above pH 8.0), $12.2\%$ (between pH 7.0 and pH 8.0) and $16.6\%$ (under pH 7.0). Like shown in herbivores, most of the urine pH was distributed as alkaline urine. Serum creatinine was shown significant difference (P<0.05) according to incidence of calculi but other serum chemistry didn't show any difference in serum chemistry. These results suggest that feeding until 26 to 31 months in Korean native steers castrated at 6 months of the age elicits urinary calculi and congestion of urinary bladder, but not clinical abnormality. And adjustment of the dietary Can ratio to a level of 2:1 or greater during feeding period may reduce the possibility of incidence of urinary calculi in Korean native steers.
One hundred and sixty Taiwan country chickens (d-old chicks) were randomly assigned into four groups with four replicates and equal sex. Basal diets were supplemented with 0, 0.5, 1 and 2% of Bazhen powder, a traditional Chinese herbal medicine complex. The study was conducted for 14 wks. Experimental results indicated that Bazhen supplement did not influence feed intake, body weight gain and feed:gain ratio. Compared with control group, the percentage of serum HDL (high-density lipoprotein) linearly increased (p<0.03) and that of VLDL+LDL (very low-density+low-density lipoprotein) linearly decreased (p<0.03) in Bazhen supplemented groups, that 2% Bazhen was significantly different with control group (p<0.05). Chickens fed diets containing 2% Bazhen displayed reduced (p<0.05) serum GOT (glutamic-oxaloacetic transaminase) levels. The IgG, ${\gamma}$-globulin levels and PHA (phytohemagglutinin) skin challenge results in 1% Bazhan supplemented group were higher (p<0.05) than in the control group, the SRBC (sheep red blood cell) and ND (newcastle disease) titers in Bazhen supplemented groups were linear higher (p<0.05) than in the control group. The liver catalase activity and the capacity of scavenging DPPH (${\alpha}$-${\alpha}$-diphenyl-${\beta}$-picrylhydrazyl) radical were linearly increased (p<0.03) in Bazhen supplemented groups, and the 1 and 2% groups were different from the control group (p<0.05). Liver TBARS (thiobarbituric acid-reactive substances) levels in all Bazhen supplemented groups and total glutathione level in the 2% group were reduced (p<0.05) compared to the control group and displayed a linear response (p<0.05). The TBA (thiobarbituric acid) and pH value of the breast muscle after 24 h post-mortem in the Bazhen supplemented groups was linear lower (p<0.05) than in the control group. Results from this study demonstrated that Bazhen supplement in chicken had several beneficial effects, including increased SRBC and ND titers, HDL and IgG, ${\gamma}$-globulin levels, PHA skin challenge result, decreased VLDL+LDL and GOT levels, and displayed antioxidation effects in serum and carcass meat parameters.
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