Showing 3 results for Ghadami
F. Shariatmadari, A. A. Moghadamian,
Volume 11, Issue 40 (summer 2007)
Abstract
The purpose of this research was to evaluate the effect of early life nutrient restriction and subsequent intermittent lighting schedule on performance in broiler. In a factorial experiment, the effect of three levels of feeding regimes and two levels of lighting schedule were investigated using 480 day-old male Hubbard chicks. The broiler chickens were randomly distributed over two rooms consisting of 4 replicates of 20 birds for each of three treatment groups. From 3 to 12 days of age treatment groups were either allowed ad-libitum access, 90% or 80% to feed. From 12 days of age until 42 days of age all birds were allowed ad-libitum access to feed. The lighting schedule for day 12 onwards in one room was a 23h light (L): 1h dark (D) lighting schedule (CL) and another room with an intermittent lighting schedule (IL, 1L:3D) from 8 AM until 8 PM . The results indicated that feed intake and feed conversion ratio of birds reared in the IL schedule were significantly lower than CL , at growth and total period of experiment (p<0.01). IL schedule did not have any significant effect on mean body weight at the end of experimental period and body weight gain at total period of experiment(p>0.05). Relative growth rate and production (PI( in the IL were higher than CL schedule (p<0.01). Feed intake and feed conversion ratio of birds given 90 and 80% of ad libitum were significantly lower in comparison with control group (p<0.01). Body weight (gain) at the end of the experiment and growth period and body weight gain in birds fed 80% of ad libitum group were significantly lower in comparison with control and 90% of ad libitum groups. At 5,6 weeks and grower period EPI and relative growth rate in birds fed 80 and 90% of ad libitum were significantly higher in comparison with control. These results indicated that feed restriction and lighting program did not have any significant effect on carcass composition (protein, fat, ash and dry matter), carcass fragment percentage (except for drumstick), abdominal fat percentage, lung , heart, right and left ventricle weight and hematocrit percentage (p>0.05), but proportion of heart weight to body weight and drumstick percentage in birds fed 80 % of ad libitum were higher than the other groups (p<0.05). Lighting schedule and feeding regime did not have any interaction effect, except for relative growth rate (p<0.05). Relative growth rate in birds with feed restriction under IL schedule was higher than birds with feed restriction under CL schedule. Intermittent lighting and feed restriction had synergic, activity effect and positive effect on body weight gain and feed convertion ratio.
S. Akhavan, S. F. Mousavi, B. Mostafazadeh-Fard, A. Ghadami Firoz Abadi,
Volume 11, Issue 41 (fall 2007)
Abstract
To investigate yield and water use efficiency (WUE) of potato with tape and furrow irrigations, an experiment was performed at Hamadan Agricultural and Natural Resources Research Center (Ekbatan station) in 2004. The experiment was arranged in a split-plot experimental design based on completely randomized block with 3 replications of irrigation water amount as the main factor (75%, 100%, 125% of cumulative evaporation from class A pan) and sub-factor of irrigation method [including tapes in the middle of furrow ridge on soil surface (TD0), tapes in the middle of furrow ridge at the depth of 5 cm (TD5), tapes on the sides of furrow ridge on soil surface (TS0), and furrow irrigation (F)]. The results indicated that yield of potato increased with increasing water use. Regardless of irrigation method, maximum (32.51 ton/ha) and minimum (19.33 ton/ha) yield of potatoes was achieved with 125% and 75% irrigation water treatments, respectively. The lowest yield (21.35 ton/ha) was obtained in furrow irrigation and the highest yield (28.91 ton/ha) belonged to tape irrigation (TD5 treatment). The highest WUE (4.68 kg/m3) belonged to tape irrigation (TD5 treatment) and the lowest WUE (3.32 kg/m3) belonged to furrow irrigation (F). The difference in WUE between 75% and 100% irrigation water treatments was not significant. The highest WUE (4.49 kg/m3) was achieved in treatment 125%. Also, it is more economical to use irrigation water treatment of 125%, as compared with other irrigation water treatments.
F. Fathian, M. Ghadami, Z. Dehghan,
Volume 26, Issue 4 (Winiter 2023)
Abstract
In this research, the trend of spatial changes in extreme indices of temperature related to the health and agriculture sectors such as the number of frost days, number of summer days, number of icing days, number of tropical nights, growing season length, diurnal temperature range, cold spell duration index, and warm spell duration index were investigated for 54 synoptic stations throughout Iran for observational (1976-2005) and future (2025-2054) periods. Daily maximum and minimum temperature data of three regional climate models namely, CCSM4, MPI-ESM-MR, and NORESM1-ME from the CORDEX project under RCP4.5 and RCP8.5 scenarios were downscaled for each station using a developed multiscale bias correction method. Then, trends and changes of extreme temperature indices were investigated using Mann-Kendall and Sen’s trend line slope methods. The results indicated that the warm indices such as the number of summer days and tropical nights indices have had a positive trend at most stations in both observational and future periods. In contrast, cold indices like the number of frost days have had a decreasing trend in most stations. The results of cold and warm spell duration indices showed that most stations have had no trend for both periods. The growing season length has increased in more than 60% of stations (45% having a significant trend) mainly located in the northern, northwestern, and western regions of the country. Based on the results, it can be concluded that without considering thoughtful climate adaptation measures, some parts of the country may face health risks and limited habitability and agriculture in the future.
