Feed represents the single largest cost in all types of sheep production. A ewe’s nutritional needs are not static. What and how much to feed a ewe depends upon many factors, including the ewe’s age, weight, and body condition
Feed represents the single largest cost in all types of sheep production. A ewe’s nutritional needs are not static. What and how much to feed a ewe depends upon many factors, including the ewe’s age, weight, and body condition, along with her stage and level of production. Climate and exercise can also have an effect on nutritional requirements.
A wide variety of feedstuffs can meet the nutritional needs of ewes during their different production stages. There is no one perfect feeding program. The choice of feeding program will depend upon geographic region, when lambs are born, and the cost and availability of feedstuffs.
Life cycle feeding of ewes
Feeding the ewe so she is gaining weight about 2 weeks before breeding is called flushing. Flushing may increase lambing percentage by increasing the number of eggs that the ewes ovulate. Flushing works best on thin ewes. Ewes that are already in good body condition usually do not respond well to flushing.
Flushing has more effect early in the breeding season. Flushing may also be beneficial late in the breeding season. Mature ewes respond better to flushing than yearlings. You can flush ewes by feeding them 0.5 to 1 lb. of grain per day or by moving them to a better pasture. If flushing is continued through the breeding season, it may enhance embryo survival during early pregnancy.
Ewes should not be bred on pastures that contain a high percentage of legumes. Clovers (especially red clover), alfalfa, and birdsfoot trefoil may delay estrus. Fescue grasses, as well as barley grain and oat grain also contain compounds with estrogenic activity. Estrogenic compounds are present in varying concentrations in most all legume plants during the entire growing season, though not when the plants are mature and dry.
Early/mid gestation is a critical period because placental development occurs from day 30 to day 90 of gestation. Placental size or weight affects nutrient transfer between the ewe and the her fetuses. Underdeveloped placentas result in lower birth weights regardless of late gestation nutrition. Twenty-one (21) days of severe underfeeding or 80 days of moderate underfeeding can affect placental development.
Knowing how much to feed ewes during late gestation can be difficult because it depends upon the number of fetuses the ewe is carrying. Underfeeding will result in the birth of small lambs. Small lambs are less resistant to cold stress and will have slower pre-weaning growth. Most of the ewe’s mammary development occurs during late gestation. Underfeeding will reduce the yield and quality of milk. Big lambs increase lambing problems and have a higher mortality rate.
The nutrients that are important during late gestation are energy, protein, calcium, selenium, and vitamin E. The amount of energy required depends upon the number of fetuses and cold stress. Winter lambing ewes usually cannot consume enough forage to meet their energy needs. More energy is required two weeks before lambing versus six weeks before lambing. Ewes carrying singles do not need to receive grain as early as those carrying multiple births.
Pregnancy toxemia or ketosis is the most common nutritional disorder that occurs dur