This study aimed to investigate the effects of reducing feed intake on performance and meat quality in old laying hens. A total of 200 Hy-Line Brown laying hens (100 weeks old) were randomly allotted to five dietary treatments: control (100% daily feed intake), 90%, 60%, 50%, and 20% daily feed intake. Each treatment was replicated four times with 10 birds per replication and two birds per cage. Ten-bird units were arranged according to a randomized block design. The feeding trial lasted for 4 weeks under a 16L:8D lighting regimen. The results indicated that the daily feed intake correlated with hen-day egg production and feed conversion ratios (P<0.05). The carcass yields and partial ratios were also correlated with daily feed intake (P<0.05). The levels of leukocytes (without basophils) were higher in the 50% and 20% daily feed intake groups than in the other groups. The concentrations of dry matter, crude ash, crude fat, and crude protein, water holding capacity, cooking loss, and fatty acids in the breast meat did not decrease as the daily feed intake decreased. In conclusion, reducing daily feed intake decreased laying performance and carcass yield but had no effect on breast meat quality.
A total of 1,200 eggs obtained from 312-day-old Hy-line Brown laying breeder hens and 319-day-old Hy-line Brown commercial laying hens (600 eggs obtained from each one) at same day were used to investigate the effects of egg storage, storage temperature, and insemination of hens on the change of albumen height, Haugh unit(HU), albumen pH, shell strength, and yolk color. Eggs were stored up to 14 days after lay at $3^{\circ}C$ or $10^{\circ}C$ and sampled one day after stored and then 24 hours interval. Longer periods of storage resulted in lower albumen height and HU at both storage temperatures, but in higher albumen pH. The eggs stored at $3^{\circ}C$ were significantly (P<0.05) higher in HU and lower in albumen pH than the ones stored at $10^{\circ}C$. The eggs obtained from the non-inseminated-hens were significantly (P<0.05) higher in albumen height, HU, and albumen pH than the eggs obtained from the inseminated-hens. Whereas, the eggs obtained from the non-inseminated-hens in the mean albumen pH of eggs stored at $3^{\circ}C$ were significantly (P<0.05) higher than the ones obtained from the inseminated-hens, but the mean albumen pH of eggs stored at 10^{\circ}C did not differ each other. The mean shell strength of the eggs obtained from the inseminated-hens was significantly (P<0.05) stronger than that of the eggs obtained from the non-inseminated-hens at both storage temperatures. Albumen height and albumen pH were negatively correlated $(P<0.01\~0.001)$ in both inseminated and non-inseminated-hen's egg groups. The degree of yolk colors was not significantly changed overall of the experimental periods in both storage temperatures. The study suggests that the change of egg freshness such as albumen height and HU is relatively more associated with storage period and storage temperature than insemination or non-insemination of hens.
Kim, H.J.;Cho, J.H.;Chen, Y.J.;Yoo, J.S.;Min, B.J.;Kim, I.H.
Korean Journal of Poultry Science
/
v.34
no.1
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pp.9-14
/
2007
This study was conducted to investigate the effects of coastal mud-flat bacteria origin protease supplementation on laying performance, nutrient digestibility and total protein concentration of serum in laying hens. A total of 252 laying hens were randomly allocated into three treatments with seven replications for eight weeks. Dietary treatments included 1) CON (basal diet), 2) PRO1 (basal diet + 0.05% protease) and 3) PRO2 (basal diet + 0.1% protease). During the entire experimental period, hen-day egg production was not affected by treatments (P>0.05). Difference of yolk height was increased in PRO1 treatment compared with CON treatment (P<0.05). Difference of egg weight was increased in PRO2 treatment compared with CON and PRO1 treatments (P<0.05). Shell quality, yolk color unit, haugh unit and egg yolk index were not affected by treatments (P>0.05). DM digestibility was improved in CON and PRO2 treatments compared with PRO1 treatment (P<0.05). N digestibility was improved in PRO2 treatment compared with CON treatment (P<0.05). Total protein concentration in serum were not affected by treatments (P>0.05). In conclusion, mud flat bacteria origin protease was effective for improving egg weight, yolk height and nutrient digestibility in laying hens.
This study was conducted to evaluate the effects of dietary herbal plant mixture on the performance in laying hens under heat stress. One hundred ninety two 54-weeks-old ISA Brown commercial layers, were used in 56 d experimental assay. Dietary treatments included CON (control; basal diet), HPM0.05 (basal diet + 0.05% herbal plant mixture), HPM0.1 (basal diet + 0.1% herbal plant mixture), and HPM0.2 (basal diet + 0.2% herbal plant mixture). For overall period, the hens fed with HPM0.1 and HPM0.2 diets showed lower in the hen day egg production than the hens fed with CON diet(P<0.05). At the end of the experimental period, egg weight was heavier in HPM 0.1 treatment than in CON (P<0.05). There were no significant differences among the treatments in egg shell breaking strength, egg shell thickness, Haugh unit, and yolk color unit. Total cholesterol concentration of yolk tended to decrease as the level of herbal plant mixture in the diet increased. Total protein of blood was higher in the hens fed with herbal plant mixture than in the hens fed with CON diet (P<0.05). Albumin concentration of blood was increased in HPM0.05 and HPM0.1 treatments compared with CON(P<0.05). Red blood cell (RBC) and white blood cell (WBC) concentrations in serum were increased in HPM0.1 and HPM0.2 treatments compared with CON treatment (P<0.05). In conclusion, dietary herbal plant mixture in laying hens under heat stress adversely affected egg production but increased total protein, albumin, RBC and WBC in blood.
This experiment was carried out to determine the optimum interval between inseminations in artifical insemination of hens. Two hundred and forty hens of Hisex commercial stock at 25 weeks of age and 20 cocks of the Rhode Island Red at 40 weeks of age were used for the experiment, and a total of 6,784 eggs were obtained. The intervals between inseminations compared in this study were: 3 days (T1), 5 days (T2), and 7 days(T3). Mixed raw semen was inseminated and the semen does was 0.03ml per insemination per hen. The inseminations were conducted at 15:00 at each time. The total number of insemination performed was 9 for the T1, 6 for the T2 and 5 for the T3, and eggs were collected over a period of 31 days, 32 days and 35 dyas, respectively. The average egg production of the hens during the experiment was 85.9% and the average temperature during the experiment was around 30$^{\circ}C$. The average sperm count was 3.69 billion per ml. The results obtained in this experiment can be summarized as follows: The fertility over the entire experimental period bythe treatment was 91.7% for the T1, 84.4% for the T2, and 75.2% for the T3. The difference between T1 and T3 in fertility was significant at 5% level. The average fertility on the second, third and fourth day after the insemination in the T2 and T3 was maintained at a relatively high level, but it tended to decline rapidly from the fifth day after the insemination. The average fertility for one week after the last insemination was 88.8% for the T1, 88.8% for the T2 and 78.6% for the T3, and none of the differences among the treatments were statistically significant. On the basis of the results from this study, it is recommended to adjust the insemination intervals within the range from the 3 to 5 days in order to maintain a highest level of fertility in the hens at an early stage of egg production as in the case of the hens used in this experiment. An insemination interval of 3 days is recommended, especially at an initial stage of insemination. For the hens with a low fertility, shortening, of the insemination interval to 3 or 2 days is desirable.
Proceedings of the Korea Society of Poultry Science Conference
/
2004.11a
/
pp.35-36
/
2004
A total of 1.200 eggs obtained from 312-day-old Hy-line Brown layer breeder hens and 319-day-old Hy-line Brown commercial layer hens (600 eggs obtained from each ones) were used to investigate the effects of storage period, storage temperature, and insemination of hens on the change of albumen height, Haugh unit (HU), albumen pH, shell strength, and yolk color. Eggs were stored up to 14 days after lay at $3\;^{\circ}C\;or\;10\;^{\circ}C$ and sampled one day after stored and then 24 hours interval. Longer periods of storage resulted in lower albumen height and HU at both storage temperatures, but in higher albumen pH. The eggs stored at $3\;^{\circ}C$ were generally higher in HU and lower in albumen pH than the ones stored at $10\;^{\circ}C$. There was no statistically difference although the eggs obtained from the non-inseminated-hens were slightly higher in albumen height and HU than the eggs obtained from the inseminated-hens. Whereas, the eggs obtained from the non-inseminated-hens in the albumen pH of eggs stored at $3\;^{\circ}C$ was significantly (P<0.05) higher than the ones obtained from the inseminated-hens, but the albumen pH of eggs stored at $10\;^{\circ}C$ did not differ each other. The mean shell strength of the eggs obtained from the inseminated-hens was significantly (P<0.05) stronger than that of the eggs obtained from the non-inseminated-hens at both storage temperatures. Albumen height and albumen pH were negatively correlated(P<0.01~0.001) in both inseminated and non-inseminated-hen's egg groups. The degree of yolk colors were not significantly changed overall of the experimental periods in both storage temperatures. The study suggests that the change of egg freshness such as albumen height and HU are relatively more associated with storage period and storage temperature than insemination or non-insemination of hens.
Ianni, Andrea;Palazzo, Fiorentina;Grotta, Lisa;Innosa, Denise;Martino, Camillo;Bennato, Francesca;Martino, Giuseppe
Asian-Australasian Journal of Animal Sciences
/
v.33
no.7
/
pp.1191-1201
/
2020
Objective: The aim of this study was to evaluate the chemical-nutritional parameters, oxidative stability and volatile profile of eggs and cakes made with eggs from laying hens fed with a dietary supplementation of extruded linseed. Methods: Two thousand ISA Warren laying hens were randomly divided into two groups: a control group was fed with a standard diet while the experimental group received the same diet supplemented with 7% of extruded linseed. The trial lasted 84 days, in which three samplings of laid eggs were performed. Samples of eggs and food systems arising from eggs were then analyzed in order to obtain information about β-carotene and total flavonoid content, antioxidant activity, fatty acid profile, lipid oxidation, and volatile profile. Results: Linseed induced the increase of α-linolenic acid with consequent reduction of the ω-6/ω-3 ratio (4.3:1 in egg yolk); in addition to this, was evidenced the cholesterol reduction and the significant increase in total flavonoids and β-carotene, although no variations were detected in antioxidant capacity. Even in cooked products there was not only a direct effect of linseed in increasing α-linolenic acid, but also in inducing the reduction of cholesterol and its major oxidation product, 7-ketocholesterol. The dietary linseed integration was also shown to affect the volatile profile of baked products. Conclusion: Data confirmed that dietary supplementation with extruded linseed resulted in food products with interesting implications for human health. With regard to the volatile profile of baked products it would be necessary undertake further sensorial analysis in order to evaluate any variations on flavor and consumer acceptability.
Two feeding trials were conducted with 128 pullets from 4 to 20 weeks of age and 96 laying hens from 23 to 63 weeks of age to evaluate the effects of scavenging and type of protein supplement on the feed intake and performance of improved pullets and laying hens. The experiments had a completely randomized design with four dietary treatments and four replicates. Treatments were: Control (Cont), scavenging but with access to a balanced concentrate at night; confinement (CF) and given the control feed ad libitum; scavenging and supplemented at night with the control feed, but with soybean meal replaced by cassava leaf meal (CLM); scavenging and supplemented at night with the control feed, but with fishmeal replaced y soybean meal (SBM). The mean daily dry matter (DMI), metabolizable energy (MEI) and crude protein intakes (CPI) of the pullets and laying hens, respectively, were 28%, and 18% higher for the confinement treatment (CF) compared to the scavenging treatments (p<0.001). The DMI, MEI and CPI of the pullets were not significantly different among scavenging treatments (p>0.05), but for the layers DMI, MEI and CPI were significantly higher for the CLM and SBM treatments compared to the Cont treatment (p<0.001). In the growing period, the average daily weight gain (ADG), supplement feed conversion ratio (FCR) and supplement feed cost/kg eggs (FCS) were not significantly different for CF compared to Cont, and among scavenging treatments (p>0.05). In the laying period, the hen-day production was significantly lower, and supplement FCR and FCS significantly higher for the CF compared to the scavenging treatments (p<0.001). Egg weight, and yolk, albumen and shell percentage and shape index were not significantly different among the scavenging treatments (p>0.05). However, shell and yolk percentages were significantly lower for the CF compared to the Cont treatment (p<0.01). Mortality was significantly higher for the CF compared to the scavenging treatments for pullets, and was significantly lower for the CF compared to scavenging treatments for laying hens (p<0.001). It was concluded that scavenging pullets and layers were getting around 28% and 18%, respectively, of their nutrient requirements from scavenging activities, resulting in correspondingly lower supplement feed conversion ratios and feed costs. Daily gains of the pullets were not affected by scavenging or protein supplement, but egg production and mortality were lower for the confined hens.
Akande, Taiwo O;Akinwumi, Akinyinka O;Abegunde, Taye O
Journal of Animal Science and Technology
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v.57
no.5
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pp.17.1-17.6
/
2015
The present study investigated the nutritional and economic suitability of cashew reject meal (full fat and defatted) as replacement for groundnut cake (GNC) in the diets of laying chickens. A total of eighty four brown shavers at 25 weeks of age were randomly allotted into seven dietary treatments each containing 6 replicates of 2 birds each. The seven diets prepared included diet 1, a control with GNC at $220gkg^{-1}$ as main protein source in the diet. Diets 2, 3 and 4 consist of gradual replacement of GNC with defatted cashew reject meal (DCRM) at 50%, 75% and 100% on weight for weight basis respectively while diets 5, 6 and 7 consist of gradual inclusion of full fat cashew reject meal (FCRM) to replace 25%, 35% and 50% of GNC protein respectively. Each group was allotted a diet in a completely randomized design in a study that lasted eight weeks during which records of the chemical constituent of the test ingredients, performance characteristics, egg quality traits and economic indicators were measured. Results showed that the crude protein were 22.10 and 35.4% for FCRM and DCRM respectively. Gross energy of DCRM was 5035 kcal/kg compared to GNC, 4752 kcal/kg. Result of aflatoxin $B_1$ revealed moderate level between 10 and $17{\mu}g/Kg$ in DCRM and GNC samples respectively. Birds on control gained 10 g, while those on DCRM and FCRM gained about 35 g and 120 g respectively. Feed intake declined (P < 0.05) with increased level of FCRM. Hen day production was highest in birds fed DCRM, followed by control and lowest value (P < 0.05) was recorded for FCRM. No significant change (P > 0.05) was observed for egg weight and shell thickness. Fat deposition and cholesterol content increased (P > 0.05) with increasing level of FCRM. The cost of feed per kilogram decreased gradually with increased inclusion level of CRM. The prediction equation showed the relative worth of DCRM compared to GNC was 92.3% whereas the actual market price of GNC triples that of DCRM. It was recommended that GNC could be completely replaced by DCRM in layer's diets in regions where this by product is abundant. However, FCRM should be cautiously used in diets of laying chickens.
The specificity of sandwich enzyme-linked immunosorbent assay (ELISA) to detect Salmonella in milk was determined in this study. The antibodies used in sandwich ELISA were egg yolk immunoglobulin G (IgY) obtained after immunization of hen with outer membrane protein (OMP) fraction from Salmonella typhimurium and rabbit IgG obtained after immunization of rabbit with the purified OMP with the molecular weight of 40,000. The immunoblot assay showed that the IgY reacted strongly with OMP with the molecular weight of 6,000 and the rabbit IgG reacted strongly with OMP with the molecular weights of 40,000, 35,000, and 6,000 from the bacteria including Salmonella which belongs to Enterobacteriaceae. The IgY and rabbit IgG also reacted with other proteins from Salmonella typhimurium in immunoblot assay. Competitive ELISA showed that IgY showed specifity to react with two strains of Salmonella typhimurium and Salmonella cholerasuis but not with Escherichia coli and Yersinia enterocolitica. Two strains of Salmonella typhimurium added to UHT milk showed the highest absorbance of all the bacteria used in the sandwich ELISA. Some strains of Salmonella cholerasuis showed higher absorbances than non-Salmonella bacteria.
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