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Dao HT, Sharma NK, Bradbury EJ, Swick RA. Effects of L-arginine and L-citrulline supplementation in reduced protein diets for broilers under normal and cyclic warm temperature. Anim Nutr 2021; 7:927-938. [PMID: 34703910 PMCID: PMC8526778 DOI: 10.1016/j.aninu.2020.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 12/09/2020] [Accepted: 12/16/2020] [Indexed: 01/13/2023]
Abstract
Heat stress causes significant economic losses in the broiler industry. Dietary supplementation of arginine (Arg) and citrulline (Cit) might increase the performance of broilers raised under warm temperature due to vasodilation effects. This study investigated the effects of L-Arg or L-Cit supplementation in broilers fed a reduced protein wheat-based diet deficient in Arg under thermoneutral (NT) and cyclic warm temperature (WT). Ross 308 cockerels (n = 720) were randomly allocated to 4 dietary treatments with 12 replicates of 15 birds per pen from d 7 to 21. The 4 treatments were: normal protein (NP), i.e., 22.3% and 20.9% crude protein in grower and finisher, respectively; reduced protein (RP), i.e., 2.5% lower protein and deficient in Arg; and RP supplemented with 0.28% Arg (RP-Arg) or 0.28% Cit (RP-Cit). A factorial arrangement of treatments was applied during the finisher phase (21 to 35 d). Factors were: diet (4 diets above); and temperature, NT (24 °C) or cyclic WT (33 ± 1 °C for 6 h per day) with 6 replicate pens per treatment. During 7 to 35 d and 21 to 35 d, the birds fed the RP diet had lower body weight gain (BWG) and higher FCR compared to the NP diet (P < 0.01). The addition of Arg or Cit to RP decreased FCR compared to RP (P < 0.01). During 21 to 35 d, the birds exposed to WT had lower feed intake (FI), lower BWG (P < 0.001) but similar FCR (P > 0.05) compared to birds exposed to NT. Diet by temperature interactions were not observed for performance parameters during the period of WT (P > 0.05). On d 35, the RP-fed birds had a lower yield of thigh and drumstick, higher fat pad, lower femur ash, and breaking strength but similar serum uric acid level and higher nitrogen digestibility on d 21 compared to those offered NP (P < 0.05). Supplementation of Arg or Cit to RP resulted in increased femur ash on d 35 (P < 0.05). Thus, feeding the NP diets is necessary to maintain growth performance in broilers regardless of the temperature conditions.
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Affiliation(s)
- Hiep Thi Dao
- School of Environmental and Rural Science, Faculty of Science, Agriculture, Business and Law, University of New England, Armidale, Australia
- Faculty of Animal Science, Vietnam National University of Agriculture, Trau Quy Town, Gia Lam District, Hanoi, Viet Nam
| | - Nishchal K. Sharma
- School of Environmental and Rural Science, Faculty of Science, Agriculture, Business and Law, University of New England, Armidale, Australia
| | | | - Robert A. Swick
- School of Environmental and Rural Science, Faculty of Science, Agriculture, Business and Law, University of New England, Armidale, Australia
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Yegoraw AA, Assen AM, Gerber PF, Walkden-Brown SW. Transmission of infectious laryngotracheitis virus vaccine and field strains: the role of degree of contact and transmission by whole blood, plasma and poultry dust. Vet Res 2021; 52:91. [PMID: 34158102 PMCID: PMC8220770 DOI: 10.1186/s13567-021-00959-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 06/03/2021] [Indexed: 11/17/2022] Open
Abstract
Understanding the mechanisms of transmission of infectious laryngotracheitis virus (ILTV) is critical to proper control as both vaccine and wild-type strains circulate within chicken flocks with potential adverse consequences. The relative efficiency of transmission by direct contact between chickens and airborne transmission has not been investigated. Furthermore, relatively high levels of ILTV DNA have been detected in poultry dust and blood but the infectivity of these is unknown. In this study, comparison of in-contact and airborne transmission of two vaccine and one field strain of ILTV revealed that all transmitted to 100% of in-contact birds by 6 days post-exposure (dpe). Airborne transmission without contact resulted in 100% transmission by 14 and 17 dpe for the wild-type and Serva vaccine virus but only 27% transmission by 21 dpe for the A20 vaccine virus. The infectivity of dust or extracts of dust and blood or plasma from infected chickens at various stages of infection was assessed by inoculation into susceptible chickens. There was no transmission by any of these materials. In conclusion, direct contact facilitated efficient ILTV transmission but the virus was unable to be transmitted by dust from infected chickens suggestive of a limited role in the epidemiology of ILTV.
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Affiliation(s)
- Addisu A Yegoraw
- Animal Science, School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia.
- School of Veterinary Medicine, Wolaita Sodo University, Wolaita Sodo, Ethiopia.
| | - Awol M Assen
- Animal Science, School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia
- School of Veterinary Medicine, Wollo University, Dessie, Ethiopia
| | - Priscilla F Gerber
- Animal Science, School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia
| | - Stephen W Walkden-Brown
- Animal Science, School of Environmental and Rural Science, University of New England, Armidale, NSW, Australia
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Chang'a EP, Abdallh ME, Ahiwe EU, Al-Qahtani M, Mbaga S, Iji PA. Energy utilization, nutrient digestibility and bone quality of broiler chickens fed Tanzania-type diets in different forms with enzymes. J Anim Sci Technol 2019; 61:192-203. [PMID: 31452906 PMCID: PMC6686144 DOI: 10.5187/jast.2019.61.4.192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/24/2019] [Accepted: 06/11/2019] [Indexed: 11/20/2022]
Abstract
A study was conducted to determine the influence of feed form and microbial enzyme supplementation on energy utilization, bone quality, and amino acid and mineral digestibility of broiler chickens. Four hundred and eighty Ross 308, day-old broiler chickens were randomly assigned to eight diets formulated from commonly used ingredients in Tanzania. A 2 (pellet or mash) × 4 (control, Axtra XB, Quantum Blue (QB) and Axtra XB + QB enzyme) factorial array in a completely randomized design having six replicates per treatment (10 birds per replicate) was used. Birds were raised in climate-controlled rooms in a 3-phase; starter (0-10 days), grower (11-24 days) and finisher (25-35 days). Apparent metabolizable energy (AME), metabolizable energy intake, net energy of production, energy retained as protein (REp), and efficiency of metabolizable energy use for energy and protein retention were higher (p < 0.05) in birds fed pelleted diets. The AME and REp was higher (p < 0.05) with enzyme supplementation. Ash content, weight, length, width and breaking strength of tibia bones were highest (p < 0.05) in birds on pelleted diets. Tibia bone traits were improved (p < 0.05) when enzymes were included, particularly in a combination of QB and Axtra XB. However, potassium, magnesium, and zinc contents were highest (p < 0.05) when QB was supplemented. Digestibility of all amino acids was higher (p < 0.05) in birds supplied with pellets and with enzyme supplementation for most amino acids, except for serine. There was a positive interaction (p < 0.05) between feed form and enzymes on lysine and phenylalanine digestibility. Digestibility of Ca, P, K, S, Zn, and Fe was higher (p < 0.05) in birds fed pelleted diets, while those on mashed diets had higher (p < 0.05) digestibility of Cu and B. The digestibility of P, K, and Zn was highest (p < 0.001) when QB was added, while Ca, P, S, and B digestibility was highest when a combination of Axtra XB + QB was applied. Pelleted diets with or without enzymes improved energy utilization, digestibility of amino acids, and minerals, and increased bone strength in broiler chickens.
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Affiliation(s)
- Edwin Peter Chang'a
- Department of Animal Science, School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia.,Tanzania Livestock Research Institute, P.O. Box 352, TALIRI Mabuki, Mwanza, Tanzania
| | - Medani Eldow Abdallh
- Department of Animal Science, School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia.,Department of Poultry Production, University of Khartoum, Khartoum 13314, Sudan
| | - Emmanuel Uchenna Ahiwe
- Department of Animal Science, School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia.,Department of Animal Science and Technology, Federal University of Technology, Owerri, Imo State 1526, Nigeria
| | - Mohammed Al-Qahtani
- Department of Animal Science, School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia
| | - Said Mbaga
- Sokoine University of Agriculture, P.O. Box 3004, Morogoro, Tanzania
| | - Paul Ade Iji
- Department of Animal Science, School of Environmental and Rural Sciences, University of New England, Armidale, NSW 2351, Australia.,College of Agriculture, Fisheries & Forestry, Fiji National University, P.O. Box-1544, Nausori, Fiji
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Sharma NK, Choct M, Wu SB, Smillie R, Morgan N, Omar AS, Sharma N, Swick RA. Performance, litter quality and gaseous odour emissions of broilers fed phytase supplemented diets. ACTA ACUST UNITED AC 2016; 2:288-295. [PMID: 29767132 PMCID: PMC5941059 DOI: 10.1016/j.aninu.2016.10.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Revised: 10/18/2016] [Accepted: 10/19/2016] [Indexed: 01/21/2023]
Abstract
The effect of graded levels of phytase on performance, bone characteristics, excreta/litter quality and odorant emissions was examined using 720 Ross 308 male d-old broilers. A 2 × 4 factorial arrangement of treatments was employed with 6 replicates of 15 birds per pen. Factors were: diets-positive and negative control (PC, NC); phytase – 0, 500, 1,000, 1,500 FTU/kg. The PC was formulated to meet the 2014 Ross 308 nutrient specifications, whereas the NC was formulated with lower Ca (−1.4 g/kg), available P (−1.5 g/kg), Na (−0.3 g/kg), dLys (−0.2 g/kg) and MEn (−0.28 MJ/kg) equivalent to nutrient matrix values for 500 FTU/kg phytase in the starter, grower and finisher periods (i.e., downspec diet). On d 24, phytase decreased FCR by 1.6, 4.3 and 4.6 points at inclusion levels of 500, 1,000 and 1,500 FTU/kg, respectively (P < 0.01) across all diets. Phytase by diet interactions on BW gain were observed on d 24 and 35 (P < 0.01). The effect of phytase was much more pronounced in the NC diet as compared with the PC diet. On d 24, phytase increased BW gain by 37, 55 and 68 g in the PC and 127, 233 and 173 g in the NC at 500, 1,000 and 1,500 FTU/kg, respectively. Diet by phytase interactions were also observed for tibia ash, litter quality and water to feed intake ratio (P < 0.01) with higher phytase effect in NC as compared with PC. Neither diet nor phytase impacted excreta moisture content on d 18 or 21 (P > 0.05). Solid phase micro-extraction gas chromatography-mass spectrometry (SPME-GC-MS) analysis of gaseous emissions on d 39 indicated no difference in the emission of alcohols, aldehydes, ketones, volatile fatty acids and phenols between treatments (P > 0.05). The results indicate that phytase has greater benefits when formulated using nutrient matrix values as compared with adding it over the top in an already nutrient sufficient diet. The later method would be expected to increase feed costs without concomitant performance benefits.
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Affiliation(s)
- Nishchal K Sharma
- School of Environmental and Rural Science, University of New England, Armidale 2351, Australia
| | - Mingan Choct
- Poultry Cooperative Research Centre, University of New England, Armidale 2351, Australia
| | - Shu-Biao Wu
- School of Environmental and Rural Science, University of New England, Armidale 2351, Australia
| | - Robert Smillie
- School of Environmental and Rural Science, University of New England, Armidale 2351, Australia
| | - Natalie Morgan
- School of Environmental and Rural Science, University of New England, Armidale 2351, Australia
| | - Amal S Omar
- Animal Production Research Institute, Agricultural Research Centre, Giza 12618, Egypt
| | - Nisha Sharma
- School of Environmental and Rural Science, University of New England, Armidale 2351, Australia
| | - Robert A Swick
- School of Environmental and Rural Science, University of New England, Armidale 2351, Australia
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