@article{leksrisompong_romero-sanchez_oviedo-rondon_brake_2014, title={Effect of feeder space during the growing and laying periods and the rate of feed increase at the onset of lay on broiler breeder female reproductive function}, volume={93}, ISSN={["1525-3171"]}, DOI={10.3382/ps.2013-03277}, abstractNote={A study was conducted to examine how 2 feeder space allocations during the rearing period followed by 2 feeder space allocations after photostimulation and 2 female feeding to peak programs (fast or slow) affected female broiler breeder reproductive performance and mortality. Sixteen pens of 76 breeder females each were equipped with either 4 tube feeders with a 132 cm circumference pan (7.0 cm/female) or 6 feeders (10.4 cm/female) to 21 wk of age. Thereafter, 64 females were moved to breeding pens, photostimulated, and fed sex-separate from either 3 (6.2 cm/female) or 5 (10.3 cm/female) feeders with either fast or slow feeding to peak feeding programs applied to complete a 2 × 2 × 2 factorial design. Seven males that were separately reared in a similar manner were added per pen. Individual female BW was determined at 6, 20, and 32 wk of age and BW uniformity assessed. Greater feeder space during rearing increased BW at 32 wk of age, whereas greater feeder space during lay or slow feeding to peak decreased BW at 32 wk. There were no differences in BW uniformity. Hens from the 10.4 to 10.3 cm/female combination produced a significantly greater number of eggs as compared with the 7.0 to 10.3 cm/female and 10.4 to 6.2 cm/female combinations with the 7.0 to 6.2 cm/female combination intermediate. Percentage hen-day egg production of the 10.4 to 10.3 cm/female combination hens was significantly greater than all other combinations. Livability was improved in the 10.4 to 10.3 cm/female combination relative to the 7.0 to 10.3 cm/female combination with the others intermediate. The fast feeding to peak program increased yolk weight as well as yolk:albumen ratio at 28 and 30 wk of age, but egg weight did not differ. These data indicated that increased or decreased feeder space between the growing and laying periods did not affect broiler breeder female BW, uniformity, egg weight, fertility, or hatchability. The 10.3 cm/female laying feeder space exhibited the best hen-day egg production in combination with 10.4 cm/pullet rearing but not with 7.0 cm/pullet rearing space. In a similar manner, hen mortality was greater in the 7.0 to 10.3 cm/female feeder space combination that the 10.4 to 10.3 cm/female combination.}, number={7}, journal={POULTRY SCIENCE}, author={Leksrisompong, N. and Romero-Sanchez, H. and Oviedo-Rondon, E. O. and Brake, J.}, year={2014}, month={Jul}, pages={1599–1607} }
 @article{leksrisompong_romero-sanchez_oviedo-rondon_brake_2014, title={Effects of feeder space allocations during rearing, female strain, and feed increase rate from photostimulation to peak egg production on broiler breeder female performance}, volume={93}, ISSN={["1525-3171"]}, DOI={10.3382/ps.2013-03219}, abstractNote={A study was conducted to determine if there were differences in female broiler breeder performance of 2 strains that had been subjected to 2 feeder space allocations during the growing period followed by 2 feeding to peak programs. Ross 308 and 708 pullets were reared with a single feeding program to 23 wk of age and with 2 circumferential feeder space allocations (5.3 cm/female or 7.0 cm/female) and then assigned to 2 feed increase programs (slow or fast) from photostimulation to peak egg production. The flock was moved to the laying house with 8.8 cm/female of female feeder space and photostimulated at 23 wk of age when Ross 344 males were added to create 16 pens with 60 females and 7 males each in a 2 × 2 × 2 design. The fast feed increase program significantly increased female BW at 31 wk of age, which could have contributed to an increased female mortality during the summer weather of early lay. The 708 females with 5.3 cm/female feeder space produced smaller eggs at 28 and 30 wk of age. The 708 females exhibited better fertile hatchability than 308 females due to fewer late dead embryos. There were no differences in egg production, fertility, or fertile hatchability due to the main effects of feeding to peak program or growing feeder space, but the slow feed increase from photostimulation to peak production reduced cumulative mortality.}, number={5}, journal={POULTRY SCIENCE}, author={Leksrisompong, N. and Romero-Sanchez, H. and Oviedo-Rondon, E. O. and Brake, J.}, year={2014}, month={May}, pages={1045–1052} }
 @article{eusebio-balcazar_leksrisompong_brake_oviedo-rondón_2014, title={Effects of feeding programme and feeder space change at photo-stimulation using maize- or wheat-based diet on growth and reproductive performance of female broiler breeders}, volume={55}, ISSN={0007-1668 1466-1799}, url={http://dx.doi.org/10.1080/00071668.2014.888395}, DOI={10.1080/00071668.2014.888395}, abstractNote={Abstract 1. This study was carried out to determine the effects of breeder feeding programme to 29 weeks of age, and feeder space change at photo-stimulation using two sources of grain on breeder hen reproductive efficiency and egg characteristics. 2. Fast-feathering Cobb 500 pullet broiler breeders were housed in 16 pens of 81 females each during rearing, and fed on either maize- or wheat-based diet, formulated to have similar nutrient composition. Two feeding programmes, Fast and Slow, were used from 14 to 29 weeks of age. At 22 weeks of age, 69 females that represented the body weight (BW) distribution from each pen were placed in a layer house where feeder space either remained very similar (from 6.3 to 6.5 cm/female) or was increased (from 6.3 to 8.4 cm/female). Breeder growth performance, reproductive efficiency and egg characteristics were evaluated. 3. Data were analysed as a 2 × 2 × 2 factorial design with diet type, feeding programme and feeder space change as the main factors. The main effects of the treatments were found but there were no treatment interactions. 4. Breeders fed on wheat were consistently heavier than breeders fed on maize from 10 to 52 weeks of age and exhibited greater hen mortality during the layer phase. Breeders fed on wheat diets exhibited improved egg production while laying eggs with a greater yolk:albumen ratio compared to the maize group. 5. The Fast feeding programme increased female mortality and increased BW during the layer phase. Breeders fed according to the Slow feeding programme had better fertility, and laid eggs with lower percentage eggshell that might be associated with the lower early embryonic mortality observed in these hens as compared with the Fast feeding programme. 6. Breeders having increased feeder space at photo-stimulation matured earlier and produced more eggs compared to breeders with no change in feeder space. 7. It was concluded that the feeding of wheat, the use of the Slow feeding programme and an increase in feeder space improved some aspects of hen productivity and egg characteristics.}, number={2}, journal={British Poultry Science}, publisher={Informa UK Limited}, author={Eusebio-Balcazar, P. and Leksrisompong, N. and Brake, J. and Oviedo-Rondón, E.O.}, year={2014}, month={Mar}, pages={253–263} }
 @article{leksrisompong_lopetcharat_guthrie_drake_2013, title={Preference Mapping of Lemon Lime Carbonated Beverages with Regular and Diet Beverage Consumers}, volume={78}, ISSN={["1750-3841"]}, DOI={10.1111/1750-3841.12028}, abstractNote={Abstract}, number={2}, journal={JOURNAL OF FOOD SCIENCE}, author={Leksrisompong, P. P. and Lopetcharat, K. and Guthrie, B. and Drake, M. A.}, year={2013}, month={Feb}, pages={S320–S328} }
 @article{leksrisompong_romero-sanchez_plumstead_brannan_yahav_brake_2009, title={Broiler incubation. 2. Interaction of incubation and brooding temperatures on broiler chick feed consumption and growth}, volume={88}, ISSN={["1525-3171"]}, DOI={10.3382/ps.2008-00412}, abstractNote={The effect of either hot or cool brooding litter temperature on feed consumption, BW, and mortality of broiler chicks that had been exposed to either normal or high temperature during latter stages of incubation was studied in 2 experiments. The duration of experiments 1 and 2 was 14 and 21 d, respectively, with BW and feed consumption determined at 2, 5, 7, and 14 d of age in experiment 1 and at 7, 14, and 21 d of age in experiment 2. High incubator temperature after embryonic d 16 decreased chick feed consumption and BW at all ages in both experiments. Hot brooding litter temperature increased feed consumption at 2 and 5 d in experiment 1 and at 7 d in experiment 2 but decreased feed consumption at 14 and 21 d in experiment 2. Feed consumption was also influenced by the incubation temperature x brooding litter temperature interaction. From 0 to 2 d or 0 to 7 d in experiments 1 and 2, respectively, the highest to lowest feed consumption was exhibited by the normal-hot, high-hot, normal-cool, and high-cool interaction groups but the order changed to normal-cool, normal-hot approximately high-cool, and high-hot from 7 to 14 and 14 to 21 d in experiment 2. Significant effects on mortality were observed in experiment 2 only where males exhibited greater mortality that was most evident in the combination of high temperature incubation followed by cool brooding. Excessive (high) eggshell temperature during the latter stages of incubation reduced feed consumption and BW through 21 d of age. However, the results showed that the hot brooding litter temperature supported increased feed consumption during the first few days of brooding even for the chicks that had been subjected to high incubation temperature. Hot brooding also reduced male mortality in experiment 2. Nonetheless, hot brooding litter temperatures should be limited as extending beyond a few days eventually decreased feed consumption.}, number={6}, journal={POULTRY SCIENCE}, author={Leksrisompong, N. and Romero-Sanchez, H. and Plumstead, P. W. and Brannan, K. E. and Yahav, S. and Brake, J.}, year={2009}, month={Jun}, pages={1321–1329} }
 @article{zakaria_plumstead_romero-sanchez_leksrisompong_brake_2009, title={The effects of oviposition time on egg weight loss during storage and incubation, fertility, and hatchability of broiler hatching eggs}, volume={88}, ISSN={["1525-3171"]}, DOI={10.3382/ps.2009-00069}, abstractNote={An experiment was conducted to determine the effect of time of oviposition, generally representing different positions in the normal egg laying sequence, on egg weight loss during storage and incubation, and on fertility and fertile hatchability of eggs from mid-lay (42 wk) and old (67 wk) broiler breeders. A total of 1,800 eggs (900 eggs per flock age) were collected during 10 consecutive days between 0830 and 1830 h each day. The eggs were individually marked, weighed, and stored for 1 to 10 d before incubation was initiated. Egg weight remained less from collection through incubation for eggs from the mid-lay flock than those from the old flock. Fresh weight of early laid (first-in-sequence; C1) eggs was significantly greater than that for the middle-of-day laid (mid-sequence; Cs), or late-in-day laid eggs (terminal-in-sequence; Ct). Percentage of egg weight loss during storage did not differ significantly between the mid-lay and old flocks but percentage of weight loss in the mid-lay flock was greater during incubation. Egg weight loss during storage of eggs from the middle-of-day laid (Cs) eggs was significantly greater than for early laid (C1) eggs, which was greater than for the late-in-day laid (Ct) eggs. Fertility was significantly decreased due to flock age but not due to oviposition time. Fertile hatchability was also significantly decreased due to flock age, but there was no significant effect of oviposition time. Early and late dead embryos increased with flock age, but there was no significant effect of oviposition time. It was concluded that there was no effect of oviposition time on fertility or fertile hatchability even though there were significant differences in egg weight and egg weight loss during storage due to oviposition time.}, number={12}, journal={POULTRY SCIENCE}, author={Zakaria, A. H. and Plumstead, P. W. and Romero-Sanchez, H. and Leksrisompong, N. and Brake, J.}, year={2009}, month={Dec}, pages={2712–2717} }
 @article{romero-sanchez_plumstead_leksrisompong_brannan_brake_2008, title={Feeding broiler breeder males. 4. Deficient feed allocation reduces fertility and broiler progeny body weight}, volume={87}, ISSN={["1525-3171"]}, DOI={10.3382/ps.2007-00285}, abstractNote={Two experiments were conducted to evaluate the effects of male broiler breeder feed intake on broiler progeny performance. In experiment 1, a low cumulative nutrition program supplied 29,580 kcal of ME and 1,470 g of CP, whereas a high cumulative nutrition program supplied 33,500 kcal of ME and 1,730 g of CP to photostimulation at 21 wk of age. Two diets (HiDiet and LoDiet) were formulated, and a single feeding program was used to achieve the selected nutrient intakes. The HiDiet group of males in experiment 1 achieved greater BW and exhibited lower fertility when fed as the LoDiet males from the onset of egg production. The HiDiet breeder males subsequently produced male broilers from eggs laid at 29 wk of age that exhibited lower BW at 42 d. This was due to the heaviest 50% of the breeder males in this treatment not gaining BW consistently due to less-than-adequate ME intake relative to their greater BW requirements. Two feeding programs during the production period (constant or increasing) were compared in experiment 2. Broilers were hatched from eggs laid at 32 and 48 wk of age to evaluate the vertical effect of male treatments on progeny performance. No difference in fertility or broiler performance was found at 32 wk. However, the constant feeding program produced lower fertility from 36 to 55 wk of age, and this resulted in a lower male and female broiler progeny BW at 42 d of age from eggs collected at 48 wk of age. Adequate breeder male feed allocation during the production period improved fertility and favorably affected broiler progeny performance in both experiments. However, broiler progeny effects were observed only when there were differences in fertility, which suggests that the males with the greatest genetic potential were not mating at these times.}, number={4}, journal={POULTRY SCIENCE}, author={Romero-Sanchez, H. and Plumstead, P. W. and Leksrisompong, N. and Brannan, K. E. and Brake, J.}, year={2008}, month={Apr}, pages={805–811} }
 @article{leksrisompong_romero-sanchez_plumstead_brannan_brake_2007, title={Broiler incubation. 1. Effect of elevated temperature during late incubation on body weight and organs of chicks}, volume={86}, ISSN={["1525-3171"]}, DOI={10.3382/ps.2007-00170}, abstractNote={Three experiments were conducted to investigate the effect of increased egg temperature during the final third of incubation on BW, yolk sac, heart, and digestive organs of broiler chicks at hatching. Egg temperatures were found to be approximately 1.0 to 1.5 degrees C higher than incubator air temperature. Elevated egg temperature (39.5 degrees C) after embryonic day 14 generally accelerated hatching time but decreased the relative weight of the heart in all 3 experiments, whereas BW and relative weights of the gizzard, proventriculus, and small intestines were significantly smaller in 2 of 3 experiments as compared with the control (approximately 38.2 degrees C). Relative weights of the yolk sac or liver were significantly larger due to elevated egg temperature in single experiments only. A striking feature of the chicks that developed at an elevated egg temperature was their white color as compared with the yellow color of chicks from eggs incubated at more normal temperatures.}, number={12}, journal={POULTRY SCIENCE}, author={Leksrisompong, N. and Romero-Sanchez, H. and Plumstead, P. W. and Brannan, K. E. and Brake, J.}, year={2007}, month={Dec}, pages={2685–2691} }
 @article{romero-sanchez_plumstead_leksrisompong_brake_2007, title={Feeding broiler breeder males. 2. Effect of cumulative rearing nutrition on body weight, shank length, comb height, and fertility}, volume={86}, ISSN={["1525-3171"]}, DOI={10.1093/ps/86.1.175}, abstractNote={Two experiments were conducted to evaluate the effects of 2 planes (low and high) of cumulative nutrient intake during the rearing period on performance of broiler breeder males. The low cumulative nutrition program supplied 29,580 kcal of ME and 1,470 g of CP, whereas the high cumulative nutrition program supplied 33,500 kcal of ME and 1,730 g of CP to photostimulation at 21 wk of age. Two diets (LoDiet and HiDiet) were used with a single feeding program in experiment 1. In experiment 2, a single diet with 2 feeding programs (LoFeed and HiFeed) was used. In experiment 1, the 2 diets were blended from 21 to 24 wk to provide a gradual transition to a single common laying breeder diet that was fed during the production period. At 21 wk of age in experiment 2, males were divided into light or heavy BW groups to complete a 2 x 2 factorial design during the production period. The high plane of nutrition increased BW, shank length, and comb height during the rearing period, but the differences disappeared after 28 wk of age. Retrospective analysis showed that the heavy males at 21 wk of age in experiment 2 were also the heaviest males at 8 wk of age. Both low plane groups (LoDiet in experiment 1 and LoFeed in experiment 2) exhibited better fertility during late production. A cumulative nutrient intake during the rearing period of 29,580 kcal of ME and 1,470 g of CP was minimally sufficient for subsequent male reproductive performance.}, number={1}, journal={POULTRY SCIENCE}, author={Romero-Sanchez, H. and Plumstead, P. W. and Leksrisompong, N. and Brake, J.}, year={2007}, month={Jan}, pages={175–181} }
 @article{zakaria_plumstead_romero-sanchez_leksrisompong_osborne_brake_2005, title={Oviposition pattern, egg weight, fertility, and hatchability of young and old broiler breeders}, volume={84}, ISSN={["1525-3171"]}, DOI={10.1093/ps/84.9.1505}, abstractNote={Two experiments were conducted to investigate egg weight, fertility, hatchability, and embryonic mortality in relation to time of oviposition of young and old broiler breeder flocks. In experiment 1, eggs were collected from 2 flocks (34 and 59 wk) for 2 d at hourly intervals between 0700 and 1900 h. Most eggs were laid between 0700 and 1300 h, but eggs were laid later in the day by the old flock. Weights of early laid (C1) eggs were significantly greater than middle laid (Cs) and the late laid (Ct) eggs in the young flock, whereas late laid eggs (Ct) were significantly smaller than early laid (C1) and middle laid (Cs) eggs in the old flock. In experiment 2, eggs from experiment 1 were categorized as early laid first-in-sequence (C1) eggs (0700 to 0800 h), the mid-sequence (Cs) eggs (0900 to 1200 h), and the late laid terminal-in-sequence (Ct) eggs (1300 to 1700 h). These eggs were incubated to determine fertility, hatchability, and stage of embryonic mortality relative to oviposition time and flock age. Fertility declined with flock age, but there were no differences due to time of oviposition. There were no differences in hatchability of fertile eggs or embryonic mortality relative to time of oviposition (sequence position) or flock age. These results suggested that although there were differences in egg weight among eggs at different times of the day (different sequence positions), there were no differences in fertility, fertile hatchability, or embryonic mortality in naturally mated broiler breeders.}, number={9}, journal={POULTRY SCIENCE}, author={Zakaria, AH and Plumstead, PW and Romero-Sanchez, H and Leksrisompong, N and Osborne, J and Brake, J}, year={2005}, month={Sep}, pages={1505–1509} }