The present research was designed to examine the effects of age variance on repeatability estimates of egg length, egg breadth and egg shape index of Bovan Nera Black laying chickens at 25, 51, 72 weeks and combined ages of the bird. For this purpose thirty birds were selected from the flock of laye...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2016-06-01
|
| Series: | Journal of Genetic Engineering and Biotechnology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1687157X16300178 |
| _version_ | 1797203771334328320 |
|---|---|
| author | Sylvia Alwell John-Jaja Abdur-Rahman Abdullah Samuel Chukwujindu Nwokolo |
| author_facet | Sylvia Alwell John-Jaja Abdur-Rahman Abdullah Samuel Chukwujindu Nwokolo |
| author_sort | Sylvia Alwell John-Jaja |
| collection | DOAJ |
| description | The present research was designed to examine the effects of age variance on repeatability estimates of egg length, egg breadth and egg shape index of Bovan Nera Black laying chickens at 25, 51, 72 weeks and combined ages of the bird. For this purpose thirty birds were selected from the flock of layers in the Babcock University Teaching and Research Farm. They were individually housed in labeled separate battery cage. A total of thirty (30) eggs were collected daily from the birds continuously for five (5) days of egg production, at each age of 25, 51 and 72 weeks. The total number of eggs collected at each age were 150 and 450 for the total of three age periods. Data were collected on egg production traits for egg length, egg breadth and egg shape index. These data were subjected to statistical analysis using Completely Randomized Design. General linear model procedure of statistical analytical system (SAS) was used to obtain the variance components for the estimation of repeatability. Moderate repeatability estimates were obtained when the age variance was included in the computation and low estimates were registered when the age variance was excluded from the computation. The repeatability estimates from different egg quality traits were low to high. Since most of the traits recorded low repeatability values, these traits can be improve by mass selection thereby culminating into egg production with optimal quality. |
| first_indexed | 2024-04-24T08:24:38Z |
| format | Article |
| id | doaj.art-475d15b9a0284fb3b8808ba961c69358 |
| institution | Directory Open Access Journal |
| issn | 1687-157X |
| language | English |
| last_indexed | 2024-04-24T08:24:38Z |
| publishDate | 2016-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Genetic Engineering and Biotechnology |
| spelling | doaj.art-475d15b9a0284fb3b8808ba961c693582024-04-16T22:58:26ZengElsevierJournal of Genetic Engineering and Biotechnology1687-157X2016-06-0114121922610.1016/j.jgeb.2016.06.003Sylvia Alwell John-Jaja0Abdur-Rahman Abdullah1Samuel Chukwujindu Nwokolo2Department of Animal Science, College of Agriculture/Babcock University, NigeriaDepartment of Animal Science, College of Agriculture/Babcock University, NigeriaDepartment of Physics, Faculty of Science/University of Uyo, NigeriaThe present research was designed to examine the effects of age variance on repeatability estimates of egg length, egg breadth and egg shape index of Bovan Nera Black laying chickens at 25, 51, 72 weeks and combined ages of the bird. For this purpose thirty birds were selected from the flock of layers in the Babcock University Teaching and Research Farm. They were individually housed in labeled separate battery cage. A total of thirty (30) eggs were collected daily from the birds continuously for five (5) days of egg production, at each age of 25, 51 and 72 weeks. The total number of eggs collected at each age were 150 and 450 for the total of three age periods. Data were collected on egg production traits for egg length, egg breadth and egg shape index. These data were subjected to statistical analysis using Completely Randomized Design. General linear model procedure of statistical analytical system (SAS) was used to obtain the variance components for the estimation of repeatability. Moderate repeatability estimates were obtained when the age variance was included in the computation and low estimates were registered when the age variance was excluded from the computation. The repeatability estimates from different egg quality traits were low to high. Since most of the traits recorded low repeatability values, these traits can be improve by mass selection thereby culminating into egg production with optimal quality.http://www.sciencedirect.com/science/article/pii/S1687157X16300178Bovan Nera BlackEggEgg quality traitsExotic chickens and repeatability |
| spellingShingle | Sylvia Alwell John-Jaja Abdur-Rahman Abdullah Samuel Chukwujindu Nwokolo Journal of Genetic Engineering and Biotechnology Bovan Nera Black Egg Egg quality traits Exotic chickens and repeatability |
| topic | Bovan Nera Black Egg Egg quality traits Exotic chickens and repeatability |
| url | http://www.sciencedirect.com/science/article/pii/S1687157X16300178 |