geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Residual feed consumption in laying hens. 2. Genetic variation and correlations


, : Residual feed consumption in laying hens. 2. Genetic variation and correlations. Poultry Science 70(8): 1663-1672

The study described here deals with the quantification of the genetic variation of "residual feed consumption" (RFC) of hens of a White Leghorn population during a 44-wk laying period (20 to 64 wk of age) in 11 time segments of 4 wk each, fed either a commercial or a low-energy diet (11.7 and 10.0 MJ ME/kg, respectively, where 1 MJ = .239 Mcal). The RFC is defined operationally as the difference between the observed feed consumption of a laying hen and its consumption as predicted from a model with metabolic body weight, egg mass production, and body weight gain as independent variables. The RFC was found to be highly heritable in all periods. The heritability of RFC accumulated over the whole laying period (RFC-T) was estimated as .42 to .62. For each time segment between 32 and 56 wk of age, genetic correlations between RFC and RFC-T were estimated to be larger than .91. The genetic sources causing variation in RFC during the first part of lay seem to differ from those causing variation later on, and to be of less importance during the rest of the laying period. It was concluded that RFC shows a considerable systematic and permanent additive genetic variance, and that RFC measurements for selection can be limited to one to three time segments between 32 and 56 wk. Furthermore, less environmental variance and therefore higher heritabilities and genetic correlations seemed to exist for birds fed the low energy diet in comparison with those fed the commercial diet. No clear differences could be found between genetic and phenotypic correlation estimates of RFC with feed consumption, metabolic body weight, egg mass production, and body weight gain.

US$19.90

PMID: 1924085

DOI: 10.3382/ps.0701663


Other references

Hattab, F., 1985: Laboratory studies on the dissolution and interaction of fluoride from sodium fluoride tablets. Acta de Odontologia Pediatrica 6(1): 1-4

Anonymous, 1987: Annual Review of Phytopathology. This volume of the series is the 25th anniversary issue and includes 6 introductory historical chapters including biographies of R. E. Smith, J. C. Walker, and H. H. Flor. The evolution and impact of phytopathology are covered next. The following...

Arzumanjan, E.A., 1964: Stud work with Ural Black Pied cattle. In 1962 in Chelyabinsk, Sverdlovsk and Perm Provinces there were 149, 000 Ural Black Pied cattle; the breeding had an av. body weight of 537 kg., and averaged 4208 kg. milk with 3.85% and 162 kg. butterfat. Data on 2315 with 1/8-<3/4 East Fries...

Sener, N.Can.; Imamoglu, A.; Bas, O.; Ozturk, U.; Goktug, G.; Tuygun, C.; Bakirtas, H., 2015: Re: Impact of pelvicalyceal anatomy in treatment with shock wave lithotripsy and flexible ureterorenoscopy of lower pole renal stones. Urolithiasis 42(6): 559-559

Thron, C.D.; Waud, D.R., 1968: The rate of action of atropine autonomic dibenamine autonomic guinea pig. Journal of Pharmacology and Experimental Therapeutics 160(1): 91-105

Lucas, A.; Lucas, P.J.; Baum, J.D., 1980: The nipple-shield sampling system: a device for measuring the dietary intake of breast-fed infants. We have devised a method for the determination of the composition of the milk infants obtain from the breast during suckling itself, suckled breast milk (SBM). The method involves the use of a nipple-shield sampling system, together with data on t...

Sher, A.; Gazzinelli, R.T.; Jankovic, D.; Scharton-Kersten, T.; Yap, G.; Doherty, T.M.; Wynn, T., 1998: Cytokines as determinants of disease and disease interactions. The immune response to pathogens results in both host resistance and immunopathology. Cytokines and in particular those lymphokines produced by Th1 and Th2 cells play a key role in determining the balance between these two immunologic outcomes. Re...

Fogdell Hahn, A.; Ligers, A.; Gronning, M.; Hillert, J.; Olerup, O., 1998: Multiple sclerosis A modifying influence of HLA class I genes in an HLA class II associated disease. European Journal of Immunogenetics 25(SUPPL 1): 62, Feb

Langdon, G.G., 1997: Comments on "Probability estimation in arithmetic and adaptive-Huffman entropy coders". This comment points out some omissions in the work of Duttweiler and Chazmas (see ibid., vol.4, p.237, 1995) on credit related to scaled-count estimators that perform count-scaling when the count of the less probable symbol (LPS) reaches a limitin...

Arkwright, J.A., 1914: Experiments on the Agglutination of Watery Extracts of B. typhosus. Journal of Hygiene 14(2): 261-284