Determination of Phosphorus Requirement for Post Molted Laying Hens using Nonlinear and Multivariate Nonlinear Mixed Effects Models

被引:1
作者
Khalaji, Saeed [1 ]
Naderi, Amir H. [2 ]
Mousavi, Seyed N. [2 ]
Zaghari, Mojtaba [1 ]
Malakzadegan, Ahmad [3 ]
机构
[1] Malayer Univ, Fac Agr Sci, Dept Anim Sci, Malayer 6571995863, Iran
[2] Islamic Azad Univ, Dept Anim Sci, Varamin, Iran
[3] Ferdowsi Univ Mashhad, Ctr Excellence, Dept Anim Sci, Mashhad 917751163, Iran
关键词
laying hens; nonlinear models; performance; phosphorus requirement; DIETARY PHOSPHORUS; AVAILABLE PHOSPHORUS; EGG QUALITY; PERFORMANCE; PHYTASE; CALCIUM;
D O I
10.2141/jpsa.0120110
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
An experiment was conducted to determine the available phosphorus (AP) requirement for post molted laying hens by using the broken line models, logistic model, saturation kinetics model and multivariate nonlinear mixed effects models. The experiment was conducted as a randomized complete block design with 5 dietary treatments (1, 1.5, 2, 2.5 and 3 g/kg of diet AP) and 6 replicates in each (72 hens per treatment). Hens were fed the experimental diets from 85 to 102 wk of age. Feed consumption and egg production were recorded daily, whereas body weight was obtained at the start of 85 and at the end of 102 wk of age and BW changes were calculated. Weekly, 1-d egg production weight was measured and egg mass was calculated. Egg qualities were measured at the end of 102 wk of age. According to the results, the optimal AP requirement from 85 to 102 wk of age for egg production, feed efficiency, egg mass, egg weight, average daily feed intake, shell breaking strength, shell thickness, egg shell percentage and BW changes were 2.1, 2.4, 2.1, 2.5, 1.8, 2.3, 2.1, 2.4 and 2.2 g/kg, respectively. The logistic model only was fitted to egg mass data and the AP requirement was 1.7 g/kg and was computed at 95% of the asymptotic response. AP requirement for maximizing the egg production and egg mass was 2.8 g/kg of diet, when multiple responses (egg production and egg mass) were analyzed simultaneously by using the multivariate nonlinear mixed effects models. The results of this study revealed that the broken line models fitted the data better than other models. According to the broken line models, the range of optimal AP requirement of post molted laying hens for various responses were 1.8 to 2.5 g/kg of diet.
引用
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页码:22 / 28
页数:7
相关论文
共 20 条
[1]   Re-evaluation of calcium and phosphorus requirements in aged laying hens [J].
Bar, A ;
Razaphkovsky, V ;
Vax, E .
BRITISH POULTRY SCIENCE, 2002, 43 (02) :261-269
[2]   The effects of dietary available phosphorus levels and phytase on performance of young and older laying hens [J].
Boling, SD ;
Douglas, MW ;
Johnson, ML ;
Wang, X ;
Parsons, CM ;
Koelkebeck, KW ;
Zimmerman, RA .
POULTRY SCIENCE, 2000, 79 (02) :224-230
[3]   The effects of various dietary levels of phytase and available phosphorus on performance of laying hens [J].
Boling, SD ;
Douglas, MW ;
Shirley, RB ;
Parsons, CM ;
Koelkebeck, KW .
POULTRY SCIENCE, 2000, 79 (04) :535-538
[4]   Dietary phosphorus supply, egg-shell deposition and plasma inorganic phosphorus in laying hens [J].
Boorman, KN ;
Gunaratne, SP .
BRITISH POULTRY SCIENCE, 2001, 42 (01) :81-91
[5]   Performance of commercial laying hens fed various phosphorus levels, with and without supplemental phytase [J].
Gordon, RW ;
Roland, DA .
POULTRY SCIENCE, 1997, 76 (08) :1172-1177
[6]   DETERMINATION OF THE PHOSPHORUS CONTENT OF LIPIDS [J].
HARRIS, WD ;
POPAT, P .
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY, 1954, 31 (04) :124-127
[7]   DIETARY PHOSPHORUS REQUIREMENTS OF FORCE-MOLTED LEGHORN HENS [J].
HOLDER, DP .
POULTRY SCIENCE, 1981, 60 (02) :433-437
[8]   Nonphytate phosphorus requirement of laying hens with and without phytase on a phase feeding program [J].
Keshavarz, K .
POULTRY SCIENCE, 2000, 79 (05) :748-763
[9]  
NRC, 1994, NUTR REQ DOM AN NUTR
[10]   A comparison of methods to estimate nutritional requirements from experimental data [J].
Pesti, G. M. ;
Vedenov, D. ;
Cason, J. A. ;
Billard, L. .
BRITISH POULTRY SCIENCE, 2009, 50 (01) :16-32