The effect of ewe nutrition during pregnancy on the reproductive system of the offspring
Human and domestic animal epidemiological studies have shown that the early life intrauterine environment can play a critical role in determining the development of various organs and systems at the cellular level, and the lifetime health status and productive performance of an individual. However,...
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| Format: | Thesis Book |
| Language: | English |
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| LEADER | 04433cam a2200313 7i4500 | ||
|---|---|---|---|
| 001 | 0000086494 | ||
| 005 | 20191218090000.0 | ||
| 008 | 140420s2014 my eng | ||
| 040 | |a UniSZA | ||
| 050 | 0 | 0 | |a SF376.2 |
| 090 | 0 | 0 | |a SF376.2 |b A86 2014 |
| 100 | 0 | |a Asmad Kari |e author | |
| 245 | 1 | 4 | |a The effect of ewe nutrition during pregnancy on the reproductive system of the offspring |c Asmad Kari. |
| 264 | 0 | |c 2014. | |
| 300 | |a 265 leaves: |b ill. (some col.); |c 30 cm. | ||
| 336 | |a text |2 rdacontent | ||
| 337 | |a unmediated |2 rdamedia | ||
| 338 | |a volume |2 rdacarrier | ||
| 502 | |a Thesis (Degree of Doctor of Philisophy in Animal Science) - Massey University, Palmerston North, New Zealand 2014 | ||
| 504 | |a Includes bibliographical references (leaves 252-255) | ||
| 505 | 0 | |a 1. Introduction -- 2. Review of literature -- 3. Effects of maternal nutrition during pregnancy on the growth and reproductive development of male sheep: a meta-analysis -- 4. Effects of maternal nutrition during pregnancy on the growth and reproductive development of female sheep: a meta-analysis -- 5. Effects of dam size and nutrition during pregnancy on fetal testicular development in sheep -- 6. Effects of ewe nutrition during pregnancy on growth and reproductive performance of malespring -- 7. Effects of dam size and nutrition during pregnancy on the ovarian development of their offspring -- 8. Effects of dam size and nutrition during pregnancy on lifetime performance of female offspring -- 9. Effects of dam nutrition during pregnancy on oxidative stress of fetal ovary and reproductive performance of female offspring -- 10. General discussion | |
| 520 | |a Human and domestic animal epidemiological studies have shown that the early life intrauterine environment can play a critical role in determining the development of various organs and systems at the cellular level, and the lifetime health status and productive performance of an individual. However, only sparse information exists for sheep, regarding the effects of maternal feeding during pregnancy under New Zealand grazing conditions on offspring growth and reproductive performance. In this thesis, two paradigms were examined; (i) Dam size (heavy vs light; selected based on extreme live weights from a commercial flock) and dam nutrition for a prolonged period in pregnancy (ad libitum vs maintenance; P21-140), and (ii) Dam nutrition during early P21-50 (ad libitum vs maintenance vs sub maintenance) and mid-to-late pregnancy P50-139 (ad libitum vs maintenance) which are to the range of nutritional treatments used by New Zealand farmers. Ad libitum was used to provide unrestricted access to pasture forage, maintenance was to ensure total live weight gain equivalent to the expected conceptus mass and sub maintenance was to achieve a loss in total ewe live weight 0.1kg/day. The growth and reproduction performance of the offspring during both the pre-natal and post-natal periods were examined. The results from this thesis indicated that is was possible to alter ovarian cell development of the female offspring during fetal and adult life by varying dam size at the time of conception. In male offspring, only mirror effects of dam size on fetal testicular cell development were observed. Maternal nutrition during pregnancy altered female offspring fetal ovarian cell development but there was no effect on reproductive performance as an adult. In fetal male offspring, maternal nutrition did not alter testicular cell development, however, minor effects were observed on adult reproductive performance. Overall, there was little effect of both paradigms on male and female offspring lifetime performance. Combined, the results suggest that farmers using similar grazing conditions to the present studies do not need to take into account nutritution of the dam when selecting male or female replacement. Future studies may consider more extreme underfeeding, but this may not be relevant on sheep farming New Zealand. Further studies are required to further investigate the possible effects of maternal siza on lifetime performance of the offspring. | ||
| 610 | 2 | 0 | |a Massey University -- |x Dissertations |
| 650 | 0 | |a Ewes -- |x Nutrition | |
| 650 | 0 | |a Sheep -- |x Reproduction | |
| 650 | 0 | |a Ewes -- |x Reproduction | |
| 655 | 0 | |a Dissertations, Academic | |
| 710 | 2 | |a Massey University | |
| 999 | |a 1000160884 |b Thesis |c Reference |e Tembila Thesis Collection | ||