Recommended Reading 136 General References 136 References 136
CHAPTER6 REPRODUCTION 2: ULTRASOUND SCANNING FOR PREGNANCY 143 Tristan Jubb
6.1 The Application of Ultrasound Pregnancy Scanning on Sheep Farms 143 6.1.1 Reasons for Scanning 143 6.1.2 The Scanning Procedure 144 6.1.3 Scanning Windows 145 6.1.4 Counting Foetuses 146 6.1.5 Foetal Ageing 146 6.1.6 The Rate of Scanning 146 6.1.7 Pathological Diagnoses 147
6.2 The Reliability and Accuracy of Ultrasound Scanning for Pregnancy 147 6.2.1 Experienced Scanners and GoodConditions of Scanning 147
6.2.2 Understanding the Discrepancy between Scanning and Lambing Results 148
6.2.3 Measures of Accuracy 149 6.2.4 Studies of Scanning Accuracy 150 6.2.5 Accuracy of Scanning for Ageing Foetuses 151 6.2.6 Analysing Accuracy from Lambing Data 152
6.2.7 If the Number of Lambs Born Is Overestimated by Scanning( Direction of Error Is Lower) 152
6.2.8 If the Number of Lambs Born Is Underestimated at Scanning( Direction of Error Is Higher) 154
6.2.9 The Cost of Misclassification 154 6.3 Conclusion 155 References 155
CHAPTER 7
' REPRODUCTION 3: DISORDERS OF EWES ÍÑ PREGNANCY AND LACTATION ABORTION, PRENATAL AND PERINATAL DISEASES OF LAMBS 157 Caroline Jacobson, Ton / Chine, Shane Besier, Stuart Barbee and Kym A Abbott
7.1 |
Husbandry of Ewes during Pregnancy |
157 |
7.1.1 |
Length of Gestation |
157 |
7.1.2 |
Nutrition during Pregnancy |
157 |
7.1.3 |
Shearing and Crutching during Pregnancy and Lactation |
157 |
7.2 |
Disorders of Ewes in Pregnancy |
152 |
7.2.1 |
Pregnancy Toxaemia |
158 |