العلاقة بين درجة حرارة المحيط ونسبة الرطوبة وبعض المعاير الفسلجية وانتاج الحليب ومكوناته في الابقار المضربة == Relationship between ambient temperature, relative humidity with some Physiological parameters, milk production and composition in cross cows
Author name:
مؤيد عبد الواحد جابرحسن الفياض
Supervisor name:
اسعد يحيى عايد
General topic:
Agricultural sciences
Specific topic:
Zoology
Degree:
Master
University:
University Of Basrah - Faculty Of Agriculture
Language:
Arabic
University location:
Basrah
First pages:
31T1868 - p.pdf
Abstract:
This study was conducted at Animal Farm, College of Agriculture, University of Basrah and Animal Farm of Aked Agriculture Secondary School, Dhi - Gar Province during the period of 1/10/2013 to 1/7/2014. The aim was to study the relationship between temperature and humidity with daily and monthly milk yield. Milk components as fat, protein, lactose and solid not fat also studied. As well as some physiological and blood parameters included in this study. A total of 28 crossed cows of different age and milking season. Cows were fed available feed within each season, while water was available during 24 hours. Results can be summarized as following : 1 - Minimum recorded THI was during January (53.24 unit) and maximum value was 78 unit recorded during June.2 - Parity had significant effect on daily and monthly milk yield. Cows of fourth parity exceeded those during 1st, 2nd, 3rd, 5th, and 6th parity. However, parity had no significant effect on milk fat, protein, lactose and solid not fat.3 - Calf sex had significant effect on daily and monthly milk yield. Male claves caused increase in milk yield. Calf sex had no significant effect on milk fat, protein, lactose and solid not fat.4 - A negative non - significant correlation between minimumormaximum temperature and daily or monthly milk yield. Daily and monthly milk yield were 4.36 and 128.75 kg during March, while they became 3.11 and 91.10 kg during June. However, temperature showed significant positive correlation with lactose (0.100 and 0.144 with minimum and maximum temperature respectively) and non - significant with either milk fat or protein or solid not fat.5 - A negative non - significant correlation existed between THI and either daily or monthly milk yield, as milk yield decreased from 4.13 and 124.16kg (daily and monthly yield respectively) during January (lowest THI value) to 3.11 and 91.1 kg respectively during June (highest THI value). On the other hand, THI correlated significantly and positively with THI (0.158) but non - significant with milk fat, protein and solid not fat, as they shoed highest values during June.6 - There were positive significant correlation between minimum or maximum temperature and THI with both morning and evening pulsing rate (0.251, 0.328, 0.306, 0.568, and 0.571 respectively). However, they had positive non - significant with rectum temperature.7 - Minimum or maximum temperature and THI showed highly significant correlation with PCV% (0.234, 0.153 and 0.213 respectively) and WBC (0.334, 0.310 and 0.374 respectively).8 - Cortisol correlated positively but non - significant with either minimum or maximum temperature or THI. Highest value of cortisol (4.38 ng/ml) was recorded during June of highest THI and temperatures
