Sentence examples for date of first egg from inspiring English sources

Date of first egg was estimated by observing nests during laying, back-dating from hatch or floating an egg during incubation following the method of Westerskov [ 36].

Nestboxes were checked regularly to obtain data on date of first egg, hatching time and breeding success throughout the breeding season.

The average date of first egg (DFE) for rock and white-tailed ptarmigan across the four years was 27 May and 30 May respectively.

Using the 14 nests with known laying date, back calculation from the nestling wing length data revealed an estimate of laying date of the first egg of the clutch with accuracy of ±1 day.

Predictor variables in these models were the wing length rank of the nestling within the brood (one or two, see " Materials and methods" described in part 1), the laying date of the first egg of the clutch (Julian date) which varied from early March until September and the interaction term between both.

Laying date of the first egg of the clutch was back-calculated (see " Materials and methods") We subsequently analyzed the relation between sex ratio and laying date.

Earlier females were more likely to lay a second brood; the median date of the first egg was 27th of April for females that laid a second clutch, and 4th of May for females that did not (Mann-Whitney U = 11.5, P = 0.0051).

Boxes were regularly monitored to determine laying date of the first egg, clutch size and hatching date.

We recorded date of the first egg laid, egg colour (as described below), egg and clutch size, and occurrence of brood parasitism.

The laying date of the first egg could also be determined this way.

During this period, each nest box was visited every 2 days to record occupancy and laying date of the first egg (in Julian days; January 1 = Julian day 1).