caa a22 4500 397568509 CHVBK 20180308164834.0 cr unu---uuuuu 161202e199601 xx s 000 0 eng 10.3382/ps.0750135 doi (NATIONALLICENCE)oxford-10.3382/ps.0750135 Analysis of Poultry Fertility Data [Elektronische Daten] 3. Analysis of the Duration of Fertility in Naturally Mating Japanese Quail1 [JOHN M. REDDISH, JOHN D. KIRBY, NICHOLAS B. ANTHONY] The purpose of the present study was to test the appropriateness of iterative least squares regression for the evaluation of fertility data in naturally mating quail. In each of four trials, 20 male and 200 female randombred Japanese quail were housed in stacked breeder cages. Paired females were exposed to their assigned male for a single 48-h period. Eggs were collected for 2 wk following removal of the male, incubated, and fertility determined by visual inspection at egg breakout. In Trials 1 and 3, sexually experienced males were placed with experienced and inexperienced females, respectively. In Trials 2 and 4, inexperienced males were placed with experienced and inexperienced females, respectively. Duration of fertility, by male, was analyzed by iterative least squares, using the model y(x) = γ/(1 + eβ(τ - x)). Overall fertility was analyzed with a log odds model following transformation to logits. Iterative least squares provided estimates of fertility duration of 3.75 to 9.18 d, with significant (P < 0.05) differences in the duration of fertility observed between individual males as well as between the trials. Differences (P < 0.05) in overall fertility (17.7 to 58.3%) were also observed, with inexperienced males paired with experienced females exhibiting the lowest overall means. Taken together, these results suggest that iterative least squares may be used to evaluate fertility in naturally mating populations and that reproductive experience can have a profound effect on the interpretation of fertility in naturally mating quail. © 1996 Poultry Science Association, Inc. Physiology and Reproduction nationallicence Japanese quail nationallicence duration of fertility nationallicence iterative least squares nationallicence data analysis nationallicence REDDISH JOHN M. aut KIRBY JOHN D. 2To whom correspondence should be addressed. aut ANTHONY NICHOLAS B. aut Poultry Science Oxford University Press 75/1(1996-01), 135-139 0032-5791 75:1<135 1996 75 ps https://doi.org/10.3382/ps.0750135 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750135 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- REDDISH JOHN M. aut NATIONALLICENCE 700 1- KIRBY JOHN D. 2To whom correspondence should be addressed aut NATIONALLICENCE 700 1- ANTHONY NICHOLAS B. aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/1(1996-01), 135-139 0032-5791 75:1<135 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford