What is Rotaterminal cross system?
Rotaterminal combines the rotational and terminal breeding systems. In a rotaterminal, top females are slected and used in a rotational cross that produces replacement gilts. Maternal breed purebred boards are used in this rotation. The replacement gilts are then mated to terminal boars for market production.
What is terminal cross?
Terminal crossbreeding is a breeding system used in animal production. It involves two (different) breeds of animal that have been crossbred. The female offspring of that cross is then mated with a male (the terminal male) of a third breed, producing the terminal crossbred animal.
What is terminal sow?
Terminal programs are programs that concentrate on using all possible heterosis and capitalizing on breed strengths. All effort is placed on maintaining 100 percent heterosis in both the pigs and the sows, and selecting breeds and breed crosses that excel in maternal or feedlot traits.
What is a three breed cross?
The three breed cross is obtained when all the females from a two breed cross are mated to a bull of a third, unrelated breed. All the three breed cross progeny are marketed.
What is the advantage and disadvantage of inbreeding?
Inbreeding results in homozygosity, which can increase the chances of offspring being affected by deleterious or recessive traits. This usually leads to at least temporarily decreased biological fitness of a population (called inbreeding depression), which is its ability to survive and reproduce.
Why is cross breeding bad?
Genetic issues. While many breeders argue that cross breeding produces healthier, stronger dogs, there is no scientific evidence to back this up. Therefore, the combination of two separate dogs could potentially lead to serious genetic entanglement issues; it could work out brilliantly, but also terribly.
Are Hereford terminal or maternal?
The Certified Hereford Beef Index is a terminal sire index that is built on a production system where Hereford bulls are mated to mature commercial Angus cows where all progeny will be targeted for Certified Hereford Beef after the finishing phase.
What is the difference between Landrace and Large White?
Landrace sows lived 92 days longer and completed 0.56 more parities on average, compared to Large White sows. Large White sows had approximately 0.5 more piglets per farrowing. The average age at first farrowing was similar in both populations.
What is a Camborough?
Camborough are a product of a cross-breeding system known as criss-crossing–an alternated use of boars of two or more breeds on the female stock produced in a herd.
Why are rotaterminal crossbreeding systems less productive?
The cost of producing replacement gilts in a rotaterminal crossbreeding system is the lower returns of the maternal litters. Also, the two breed rotational cross females have only 67% heterosis and thus are not as productive as F 1 or three breed cross females with 100% heterosis. Table 3. System average, weighted by proportion matings in system.
Is it better to have two or three Rota terminals?
A common question about rota-terminal programs is whether it is better to have two or three breeds within the maternal rotation. In a two-breed maternal rota-tion, maternal heterosis retention is 67 percent; in a three-breed rotation, maternal heterosis retention is 86 percent.
How to get to the Naval Station Rota?
Rental Car (Off Base): DoYouSpain may be able to get you something local or Miguels (011-34-956-81-1848) is another option. Taxi/Shuttle: See AMCGRAM for info. Local Bus: Bus station is just outside the Rota gate. Here is the local Rota Bus Web Site with maps and schedules (Spanish).
What’s the time of day to go to Rota?
“Nominal” hours are 0900 – 1300 (Mon to Fri). It near Hotel Playa de la Luz and the Blue line bus route but taxi or car is better. Present your passport and boarding pass (or copy of manifest) to whoever greets you.