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Articles by B. Kamers
Total Records ( 3 ) for B. Kamers
  K. Tona , K. Agbo , B. Kamers , N. Everaert , H. Willemsen , E. Decuypere and M. Gbeassor
  Chicken post-hatch performance is known to be related to embryonic developmental parameters. However, strain or genotype differences with regard to embryo physiological parameters have received little attention. A total of 1,200 hatching eggs produced by Lohmann Brown (LB) and Lohman White (LW) breeders of the same age were studied. Between 62 and 150 h of incubation, eggs Resonance Frequency (RF) was measured as indicator of early embryonic development. Also, albumen pH was measured between setting and d 8 of incubation. From d 10 to 18 of incubation, remaining albumen and embryos were weighed. During the last days of incubation, hatching occurrences were monitored after every four hours and hatched chicks were recorded. Results indicate that RF of LW eggs were lower than that of LB eggs (p<0.01) and starting time point of RF decrease occurred earlier in LB eggs than in LW eggs. Albumen pH of LB eggs was lower than that of LW eggs at day 8 of incubation. Remaining albumen weight at 14 and 16 d of incubation was lower in LB than in LW (p<0.05) while embryo weights increased more rapidly in LB strain than in LW strain. It is concluded that LB and LW embryos have different growth trajectories and should be incubated at different conditions.
  K.E. Nouboukpo , K. Tona , B. Kamers , N. Everaert , H. Willemsen , O.M. Onagbesan , M. Gbeassor and E. Decuypere
  The effects of in ovo injection of L-carnitine on hatchability and juvenile performance of 360 layer-type chicks were investigated. Fertilized eggs were injected in air chamber with L-carnitine (500 and 1000 μmol) dissolved in 0.9% of Saline (NaCl) at d 18 of incubation. Two control groups (non-injected and injected with 0.9% of Saline were also included. Hatched chicks was recorded after every 4 h, beginning at 490 h of incubation and ending at 514 h, for incubation length and hatching spread determination. At the end of incubation, hatched chicks were recorded according to treatment for determination of hatchability. At 3, 7 and 14 d post-hatch, chick body weight (BW) and morbidity were recorded. Also, at d 3 and 7 post-hatch, 14 birds from each of 2 replicate groups within each treatment were used for intestine and yolk sac weight determination. Results indicate that BW, hatchability, or relative intestine weights were not affected by treatment. However, incubation length was longer while hatching spread was shorter in L-carnitine groups compared to control groups. Yolk sac relative weight was decreased by treatment with L-carnitine (P < 0.05). Also, the percentage of chicks showing morbidity sign was lower in L-carnitine treated groups from d 7 onwards. The results of the present study suggest that in ovo injection of L-carnitine at d 18 of incubation delayed hatching time but resulted in narrower hatching spread, faster utilization of yolk sac content and improved morbidity.
  K. Tona , K. Bahe , B. Kamers , K. Mertens , B. Kemps , O.M. Onagbesan , E. Decuypere and M. Gbeassor
  Increasing egg storage duration affects egg internal quality, especially albumen quality by increasing pH and decreasing Haugh Unit (HU). But, in most of African contexts, egg producers, sellers and consumers store the eggs in different conditions regardless of quality deterioration. In this study, 1920 eggs produced by Lohmann layer flocks of 48 weeks and 58 weeks of age were investigated. The eggs were divided randomly and equally in 4 groups and stored at 3 different conditions for 21 days at: 1) Room Conditions (RoC); 2) Super Market Conditions (SmC) and 3) Refrigerator Conditions (RfC). During storage, all the eggs were weighed and Resonant Frequency (RF) were measured at day 3, 6, 9, 12, 15, 18 and 21 according to flock age and storage condition. Then at the same days, sample of 30 eggs per flock and per storage condition were used to measure albumen pH and HU. The results indicate that eggs weight decreased significantly with storage duration (P<0.001). But, egg relative weight loss was lower (P<0.01) for eggs of RfC group than that of SmC and RoC groups. There was a positive linear relationship between RF and storage duration. But, daily increase in RF was affected by layer flock age. The highest daily increase was obtained in RoC group or SmC group, respectively for flock of 48 weeks of age or flock of 58 weeks of age. Eggs of RfC groups had the highest albumen HU and the lowest albumen pH (P<0.001). It is concluded that detrimental effects of storage duration are more or less pronounced depending on storage conditions especially storage environmental temperature. It is recommended that, in African countries, consumption eggs can be stored at room or super market conditions not longer than 6 days but in the refrigerator up to 21 days.
 
 
 
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