304 North Cardinal St.
Dorchester Center, MA 02124
304 North Cardinal St.
Dorchester Center, MA 02124
What Is Sponging Sheep? Progestogens are a synthetic version of the naturally occurring sex hormone progesterone. These sponges are used to bring all the ewes in the breeding flock into season or oestrus at the same time meaning they will all be lambing down in and around a very specific time frame.
What does it mean to sponge sheep? Sheep are seasonal breeders – in ewes oestrus begins as day light hours start to decrease in the autumn. The use of sponges allows for oestrus to be synchronised and thereby allows the use of PMSG to be used to increase ovulation rates and ultimately the litter size of ewes successfully mated.
How do sheep sponges work? Sheep sponges and PMSG
Using progestogen impregnated sponges as part of the breeding programme allows a group of ewes to be mated as a batch on one day, and the use of a hormone injection PMSG will increase ovulation rates and in turn improve litter size.
How long do you leave sponges in ewes? Leave them in for at least 48 hours, take them out, feed and rest them and re-introduce them 16 days after sponge removal for a week. Recommended ewe/ram ratio for the first oestrus is 10:1, with less ram power required for the second cycle. Harnesses should only be used from the second cycle.
Sheep: Insert Eazi-Breed CIDR devices during the breeding season and leave in place for 12 to 14 days. Ewes will be in oestrus for mating or insemination approximately 54 hours after device removal. For spring joining, it is recommended that the device be used in conjunction with PMSG 400 to 500 IU.
After mating, sheep have a gestation period of around five months. Within a few days of the impending birth, ewes begin to behave differently.
Ram to Ewe Ratio
A ram can usually mate 3 to 4 ewes per day. In general, the recommended ratio for mature rams is 1:35 to 1:50. In large flocks, the percentage of rams to ewes is often higher.
The “ram effect” is when non-cycling ewes are stimulated to ovulate by the sudden introduction of a novel ram. Rams produce chemical substances called pheromones, which are perceived by the ewe and can stimulate the onset of estrus in peripubertal ewes or ewes approaching the onset of the breeding season.
You have the cost of the sponge (€1.60/ewe) and the cost of the PMSG (approx €3.00/ewe) to increase litter size.
Fall or out-of-season lambing involves breeding ewes in April and May to produce lambs in September and October. The inability of most breeds of sheep to cycle and breed in the spring to early summer is a major constraint for success. Weather conditions are ideal for pasture lambing.
Twin Lamb Disease (TLD) can occur in thin or over fat ewes and is triggered by a stressful event such as a change in weather, change in diet or foot problems which results in a critical shortage of blood glucose causing a demand on the ewe using her backfat for energy.
This can be largely achieved by treating ewes with progesterone for 10 to 12 days to synchronize estrus. When the progesterone is removed, the ewes exhibit estrus and can be bred at this time. However, for the largest lamb crop, breed the ewes following the second estrus after progesterone treatment.
The average gestation period for sheep is around five months, although this may be a little shorter in some cases. However, a ewe’s pregnancy is not usually obvious until about six weeks before giving birth to her offspring.
In October the rams are put out with the ewes for breeding. Rams are sometimes called ‘tups’, and mating is often referred to as ‘tupping’. An experienced ram will be put out with anything from 50 to 100 ewes, while a less experienced ram will serve 25.
Length of the estrous cycle in sheep is on average 17 days but can vary between 14 and 19 days. Average duration of estrus is 24 to 36 hours, with ovulation occurring toward the end of estrus or approximately 24 hours after the onset of estrus.
Overall, we concluded that autoclaving the CIDRs previously used for 22 days had no positive effects on estrous and pregnancy rates when applied as primings for the ram effect during the non-breeding season.
Re: Life of CIDRS
CIDRs will not expire in the sense that an expired one will not harm the cow, however, as with any drug, with time they begin to lose some of their efficacy.
To insert a CIDR, first restrain the animal and then clean the area of the vulva thoroughly. Put the body of the insert into the applicator, with the tail in the slot. Apply lubricant to the tip of the insert and position the insert with the tail on the underside of the applicator, curling down.
While the butchering was going on, you could tell she sensed it, although there is no sound of distress during the butchering: since the animals die instantly, there is no distress. I have cried on butcher day in the past, when it is over. It is on my mind, a conscious decision I make to kill an animal to eat it.
African elephants are pregnant for up to 22 months, while Asian elephants are pregnant for 18-22 months. This is actually the longest gestation period of all mammals, which makes sense when we think about how big elephants are.
The lambs will stay with their mother until they are about 5 months old. At 6 months, they are considered fully grown.
It is best to put all rams and wethers together at the same time after sheep breeding season to save yourself having to do several small groupings and reintroductions, and to prevent deaths.
And like Jav said, real ram air does in fact work. Plenty of systems out there do not work, but the theory is valid. Most gains on “ram air” or “cold air” intakes is a result of colder, denser air charges and less restriction in the intake flow tract.
Cold air intakes and short ram intakes both have the same goal, which is to increase horsepower. Short ram intakes (SRI) look to increase power by reducing the amount of restriction on the intake air. In many vehicles, the intake air passes through a resonator and silencer box to help reduce induction noise.
The major benefit of the ram effect is the synchronisation of oestrous activity; a high percentage of ewes ovulate, conceive and subsequently lamb over a short period of time. Such synchronization necessitates one fertile ram per 25 – 30 ewes.