Litter-of-origin trait effects on gilt development1
| Autor: | J. L. Vallet, Clay A. Lents, D. J. Nonneman, Robert A. Cushman, Lea A. Rempel, Gary A. Rohrer, C. E. Phillips, Kenneth J. Stalder, Jeremy R. Miles, B. A. Freking, J. A. Calderón-Díaz |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Estrous cycle 0402 animal and dairy science Mammary Gland Tissue Uterus Uterine horns 04 agricultural and veterinary sciences General Medicine Biology 040201 dairy & animal science 03 medical and health sciences Follicle 030104 developmental biology medicine.anatomical_structure Animal science Genetics medicine Colostrum Weaning Animal Science and Zoology Uterine gland reproductive and urinary physiology Food Science |
| Zdroj: | Journal of Animal Science. 94:96-105 |
| ISSN: | 1525-3163 0021-8812 |
| Popis: | The preweaning litter environment of gilts can affect subsequent development. In a recent experiment designed to test the effects of diet on gilt development, litter-of-origin traits including individual birth weights, immunocrits (a measure of colostrum intake), sow parity, number weaned, and individual weaning weights were collected for approximately 1,200 gilts that were progeny of approximately 300 sows. Subsequently, BW, LM area, and backfat were measured at 100 d of age and at 28-d intervals until slaughter (260 d of age). From 160 d of age to slaughter, gilts were observed daily for estrus. At slaughter, the reproductive tract and 1 mammary gland were recovered. The reproductive tract was classified as cyclic or prepubertal; the number of corpora lutea was counted. Uterine horn lengths and ovarian dimensions were measured. Uterus and ovary samples from every 10th gilt were prepared for histological evaluation of uterine gland development and follicle counts, respectively. Mammary gland tissue protein and fat were assayed. Day of the estrous cycle at slaughter was calculated using the first day of the most recent standing estrus (d 0) recorded previous to slaughter. Each gilt development trait was analyzed for association with each litter-of-origin trait, after adjusting for dietary treatment effects. Uterine length, ovarian dimensions, mammary gland protein and fat, and uterine gland development were also adjusted for day of the estrous cycle at slaughter. All litter-of-origin traits were associated ( 0.05). These results indicate that colostrum consumption, birth weights, preweaning growth rate, number weaned, and parity are associated with gilt development traits during later life. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|