Page 12 of articles about genetics-reproduction in Articles

The dispersion of matings described in the previous article is even more drastic on farms operating in bands over one week.

When gilts were mated at a little more than 100 kg, productivity at 2nd parity had a huge decline and the sow was never able to reach their maximum potential.

In the last chapter on hormone management we looked at the advantages of “a la carte” altrenogest treatment as opposed to the 18 day treatment used to synchronize gilts.

In this chapter the use of progesterone derivatives to modify the duration of estrus in sows is explained.

A good result in stillbirths is difficult to achieve without inducing farrowings.

The farm, with an elevated number of animals, had been experiencing for several days an increased number of births in gestation on the weekend before moving the sows to the farrowing pens. Mortality in these births was 100%.

In this chapter we will present the farrowing stages and how to control it.

In Denmark the most common practice is to always stimulate with the boar together with a complete 5 point pattern of stimulation carried out by the inseminator.

The milk production of sows is one of the parameters that has evolved the most over the last several decades.

In this chapter we will take a look at some other aspects of farrowing induction...

The most relevant genetic defects of the skin are epitheliogenesis imperfecta, pitryisis rosea and malignant melanoma. Recent data suggest an increase of the melanoma incidence in Duroc bred, incidences of 2.60% and 0.62% have been found in two Duroc nucleus herds.

This may be a good option when farrowings and litter control during the first days are the priority.

On small farms it is better to group tasks on specific days, leaving other days with less tasks in order to organize days off...

Hernias are the most common genetic defect and often cause welfare problems as well as economic loss.

The standard database for inherited traits and disorders in animal species (OMIA) lists 29 single-locus disorders, nine of these have been characterized at the molecular level, meaning that DNA testing may be used for control.

In the last chapter we examined mating guidelines that came rather close to being ideal, given that they achieve the following objectives: At least one mating should be adjusted to meet the ideal time and achieve the first objective with the least number of matings.