02780cam a2200265 a 4500003000900000005001700009008004100026040002800067041000800095100003700103245021700140246017000357260005500527300003100582502009700613520157400710530002202284653001902306653001302325653002502338700003402363700004702397700003702444856003302481EG-GiCUC20250223031549.0160924s2016    ua d   f m    000 0 eng d  aEG-GiCUCbengcEG-GiCUC0 aeng0 aSherien Abdelrahman Yassien Ali 10aEffect of climate change on milk production of holstein cows maintained in the Nile Delta of Egypt / cSherien Abdelrahman Yassien Ali ; Supervised Rabie Ragab Sadek , Ali Attia Nigm , Mohamed Abdelaziz Elwardani15aتأثير التغيرات المناخية على إنتاج اللبن فى أبقار الهولشتين المُرباة فى دلتا النيل بمصر  aCairo : bSherien Abdelrahman Yassien Ali , c2016  a56 P. : bcharts  ; c25cm  aThesis (Ph.D.) - Cairo University - Faculty of Agriculture - Department of Animal Production  aThe main objective of the study was to monitor the current and future climate  changes and to evaluate their effects on milk yield of Holstein cattle in the Delta of Egypt.  This thesis includes two studies, the first was conducted to evaluate the effect of current  climate changes on milk yield. Data of test-day milk yield (TDMY) comprised 109759  records, were collected from four herds (5546 Holstein cows). The four herds represented  different parts of the Delta region: west of the Delta (Dina farm, included two h erds, H1 and  H2), east (Sami Asaad farm, H3) and middle of Delta (El-Karada farm, H4). Meteorological  data (monthly air temperature and relative humidity) throughout the period from 2000 to  2014, and their expected corresponding values in the two years 2025 and 2050 were obtained  from the Central Laboratory for Agricultural Climate.  Analysis of meteorological data revealed a significant increase in temperature- humidity index (THI) values, and confirmed a marked change in climate starting the year  2011. So, the study period (2000-2014) was devided into two periods: the first was with  almost a constant value of THI (2000-2011), and the second with a higher value (2012- 2014). All the factors (Herd, Parity, THI, Period and all interactions among factors ) showed  a highly significant effect (P<0.0001) on TDMY. Test-day milk yield decreased (P<0.05)  when THI was >74. Test-day milk yield, also decreased (P<0.05) in the second period. Test- day milk yield was 24.2 and 22.8kg for the first and second period, respectively. This d  aIssued also as CD 4aClimate change 4aHolstein 4aTest-day milk yield 0 aAli Attia Nigm , eSupervisor0 aMohamed Abdelaziz Elwardani , eSupervisor0 aRabie Ragab Sadek , eSupervisor  uhttp://172.23.153.220/th.pdf