Reproductive and Litter Performance of Sows Mated Durign Lactation PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Reproductive and Litter Performance of Sows Mated Durign Lactation PDF full book. Access full book title Reproductive and Litter Performance of Sows Mated Durign Lactation by Calvin Walker. Download full books in PDF and EPUB format.
Author: Calvin Walker
Publisher:
ISBN:
Category : Sows
Languages : en
Pages : 28
Get Book Here
Book Description
An experiment was conducted with 51 control and 51 experimental confinement- managed purebred Yorkshire sows of various parities to (1) determine whether confinement-managed sows during lactation would exhibit estrus, mate, and conceive as a consequence of a daily regimen of a short period of separation from their litters, mixing sows together during the separation period, and exposure to a boar during this period; (2) assess effects of the experimental regimen on the preweaning and early postweaning performance of litters currently nursing; and (3) assess effects of the experimental regimen on size and performance to weaning of litters farrowed as a consequence of mating during lactation. Separation of dams from their litters for six hours a day for a minimum of seven and a maximum of 20 days during lactation resulted in occurrence of estrus and mating by 80% of sows during lactation with no adverse effect on preweaning performance of current and subsequent litters; 90% of the control sows mated during a 20 day period following weaning. Postweaning average daily gain and feed intake for the current litters of the experimental group sows during each of the three weeks of measurement was greater than for the litters from the control sows; these differences were statistically significant (P
Author: Calvin Walker
Publisher:
ISBN:
Category : Sows
Languages : en
Pages : 28
Get Book Here
Book Description
An experiment was conducted with 51 control and 51 experimental confinement- managed purebred Yorkshire sows of various parities to (1) determine whether confinement-managed sows during lactation would exhibit estrus, mate, and conceive as a consequence of a daily regimen of a short period of separation from their litters, mixing sows together during the separation period, and exposure to a boar during this period; (2) assess effects of the experimental regimen on the preweaning and early postweaning performance of litters currently nursing; and (3) assess effects of the experimental regimen on size and performance to weaning of litters farrowed as a consequence of mating during lactation. Separation of dams from their litters for six hours a day for a minimum of seven and a maximum of 20 days during lactation resulted in occurrence of estrus and mating by 80% of sows during lactation with no adverse effect on preweaning performance of current and subsequent litters; 90% of the control sows mated during a 20 day period following weaning. Postweaning average daily gain and feed intake for the current litters of the experimental group sows during each of the three weeks of measurement was greater than for the litters from the control sows; these differences were statistically significant (P
Author: Chantal Farmer
Publisher: BRILL
ISBN: 9086868037
Category : Technology & Engineering
Languages : en
Pages : 452
Get Book Here
Book Description
The last book on the lactating sow was published over 15 years ago. This new book brings us up to date in current knowledge on the gestating and lactating sow. It covers new and important topics such as conditioning of gilts for optimal reproductive performance, feeding high fibre diets to gestating sows and providing various fat sources in gestation and lactation. It also describes the several key success factors to group-housing systems in gestation, which is a must due to the current move towards group-housing. The new concept of transition feeding for sows is discussed, as well as the factors involved in mammary development of gilts and sows, both of which are instrumental for maximum colostrum and/or milk yields. The impact of the human-animal interactions on sow welfare and performance is discussed with focus on new handling practices that could be developed to overbalance the negative interactions inherent to pig management systems. Updates on must-have topics, such as amino acid and energy requirements of sows, colostrum and milk yield and composition, and sow health are also provided. The subjects covered in this book will assist animal scientists, nutritionists, veterinarians and swine producers in learning the most recent information on relevant and current topics affecting sow production, and in knowing which areas are in need of further research efforts.
Author: L.L. Hoving
Publisher:
ISBN: 9789461731470
Category :
Languages : en
Pages : 171
Get Book Here
Book Description
Author: Joel Howard Brendemuhl
Publisher:
ISBN:
Category :
Languages : en
Pages : 318
Get Book Here
Book Description
Author: Todd Aaron Armstrong
Publisher:
ISBN:
Category : Swine
Languages : en
Pages : 178
Get Book Here
Book Description
Author: Tai Yuan Chen
Publisher:
ISBN:
Category : Lactation
Languages : en
Pages : 258
Get Book Here
Book Description
In primiparous sows, feed intake is generally insufficient to meet lactation demands during lactation. Inadequate nutrient supply increases mobilisation of body reserves during lactation and, as a consequence, affect subsequent reproduction. Excessive loss of body reserves during lactation is not only associated with delayed post-weaning oestrus and the size of the subsequent litter, but also increases culling rate and reduces sow longevity and the productivity of the breeding herd. The aim of the thesis was to develop a clear understanding of the impact of a negative energy balance during lactation affects reproductive performance of modern primiparous sows in Australia, and evaluate feeding strategies involving energy manipulations during crucial periods for improving subsequent litter size. In the first study, the associations of sow body weight changes during lactation and the body weight at weaning with subsequent reproductive performance were studied. By minimising body weight loss and maintain adequate body reserves at weaning through the supply of sufficient energy when rearing equal to or less than ten piglets during lactation, the post-weaning reproduction of modern primiparous sows may not be affected. In the second study, the carry-over effects of energy intake during the early antral phase and subsequent follicular phase on follicle recruitment and ovulation rate were assessed using a gilt model. Follicle size at the end of the luteal phase was greater for gilts that were previously fed at a high feed level. During the follicular phase, high feeding increased follicle size at Day 5 and plasma oestradiol concentration. Nevertheless, a low feed level during the luteal phase reduced ovulation rate and the number of embryo, and this was not counteracted by feed level during the follicular phase. Plasma progesterone concentration after ovulation was lower for gilts that were restricted-fed throughout the whole period than for other treatments. These results indicate that undernutrition during early antral follicular development may have a residual effect on follicle recruitment and quality. In the third study, the effects of substituting 1 kg of a standard lactation diet with 1 kg of a sugar-rich or fat-rich diet during late lactation on blood glucose and insulin changes were investigated. The results suggest that a sugar-enriched diet during the last week of lactation elevates circulating glucose and insulin concentrations, and may potentially improve post-weaning fertility in primiparous sows. Therefore, the fourth study investigated the effects of pre-weaning energy substitutions plus post-weaning altrenogest treatment as positive control on follicular development, endocrine characteristics and subsequent litter size in primiparous sows. The weaning-to-ovulation interval tended to be reduced in the sugar-rich treatment, although body weight loss during the treatment period, post-weaning follicle development, plasma oestradiol and pre-weaning leptin did not differ among treatments, except body weight loss was lower and leptin was higher in the altrenogest treatment. Post-ovulatory progesterone concentration in the sugar treatment was higher. Sows in the sugar-rich and altrenogest treatments had a greater proportion of litters with larger litter sizes. The outcome indicates that increasing circulating insulin and glucose concentrations during late lactation or a week of metabolic recovery positively improves subsequent litter size in primiparous sows. Industry will be able to achieve and improvement of reproductive performance by maximising energy intake (using an insulin-stimulating diet) during late lactation, or by post-weaning altrenogest administration for a week for energy restoration. Otherwise, adverse impacts of a negative energy balance during lactation will be carried over into the mating period, and will depress subsequent reproductive performance.
Author: James L. Krug
Publisher:
ISBN:
Category : Lactation
Languages : en
Pages : 172
Get Book Here
Book Description
Author: Jestina Kusina
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
Get Book Here
Book Description
Author: Yūzō Kōketsu
Publisher:
ISBN:
Category :
Languages : en
Pages : 532
Get Book Here
Book Description
Author: Robert J. C. Smits
Publisher:
ISBN:
Category : Sows
Languages : en
Pages : 344
Get Book Here
Book Description
