Views: 1 Author: Site Editor Publish Time: 2026-04-27 Origin: Site
When the first frost settles in the north, or the cold rains begin to cut through the south, sheep farmers enter one of the most challenging periods of the year. In nature, winter is not only a drop in temperature, but also a standstill in biomass production. For sheep, which rely heavily on herbivorous nutrition, the arrival of the dry forage season means a sharp decline in both energy and protein supply from natural pastures.
However, in practice, there is a common misconception that sheep are highly resilient and only need to be kept from “starving” during winter. This neglect of precise nutritional supplementation is quietly becoming a hidden cause of economic losses on many farms. Insufficient winter supplementation (underfeeding) is far more than simple weight loss—it represents a systemic breakdown that extends from cellular metabolism to immune defenses and even the reproductive system. A deeper understanding of its disease risks is not only a veterinary issue, but also a core logic of modern livestock productivity.
During winter, sheep require significantly higher basal metabolic energy (BMR) to maintain body temperature compared to spring or autumn. When dietary energy intake fails to meet both thermoregulation and maintenance demands, sheep activate a dangerous self-survival mechanism: extensive mobilization of body fat reserves.
The liver is the central hub of lipid metabolism in sheep. Under severe underfeeding conditions, large amounts of fatty acids are transported to the liver for oxidation. However, the ruminant liver has a limited capacity to process fatty acids. When carbohydrate deficiency leads to a lack of oxaloacetate, fatty acid oxidation becomes incomplete, resulting in the excessive production of ketone bodies (acetoacetate, β-hydroxybutyrate, and acetone).
Once this metabolic state becomes unbalanced, it develops into clinical pregnancy toxemia, particularly common in ewes carrying multiple fetuses. Affected animals may show depression, visual impairment, and in severe cases, neurological signs. Ultimately, death occurs due to severe metabolic acidosis and multi-organ failure.
This condition is essentially the result of a collision between winter energy deficits and high physiological demands.
Nutrition forms the foundation of immune function. A flock suffering from underfeeding experiences a sharp decline in lymphocyte proliferation and antibody production. Under the combined stress of winter cold and poor ventilation, this immunosuppressed state becomes an ideal environment for pathogen outbreaks.
A typical example is bovine respiratory disease complex (BRD-like respiratory syndrome in sheep). Opportunistic pathogens such as Pasteurella and Mycoplasma, normally present at low levels in the respiratory tract, rapidly proliferate when mucosal immunity is weakened and invade the lungs.
In addition, reduced metabolic heat production forces animals to huddle closely for warmth, increasing physical contact and accelerating horizontal transmission within the flock.
The digestive tract is equally vulnerable. Feeding excessive low-quality fiber (such as over-mature crop straw) without sufficient protein supplementation to support rumen microbial activity may lead to omasal impaction. This mechanical blockage can further cause secondary gut microbiota imbalance and trigger enterotoxemia, resulting in sudden and significant mortality losses.
For breeding-focused farms, the impact of winter underfeeding is often delayed—but this delay makes it even more destructive.
Maternal nutrition during mid to late pregnancy directly determines lamb birth weight and the accumulation of brown adipose tissue. Studies show that nutritionally deficient ewes have impaired placental development, resulting in low birth weight lambs. More critically, these lambs lack sufficient energy reserves to survive postnatal cold stress and are highly prone to hypothermia.
Furthermore, when nutrients are prioritized for maternal survival, mammary gland development is suppressed. Colostrum quality in underfed ewes is poor, with reduced immunoglobulin (IgG) content, leaving lambs without adequate passive immunity. This “nutritional generational failure” can lead to widespread lamb mortality and severe economic losses for the entire production cycle.
Traditional hay-based systems are increasingly insufficient for modern intensive sheep farming during long winter forage gaps. A key solution lies in technologies that can provide consistent, high-quality green fodder year-round.
The HydroFodder Livestock Feeding Solution addresses this challenge. By using controlled indoor hydroponic systems, seeds can be transformed into enzyme-rich, vitamin-rich, and high-protein green fodder within just seven days. This highly digestible feed not only fills the winter energy gap but also significantly enhances mucosal immunity due to its bioactive compounds.
For farm operators pursuing efficiency, implementing a hydroponic fodder production system is not merely a feed upgrade—it is the construction of a physiological defense barrier against metabolic and infectious diseases in winter.
Beyond macronutrients, winter underfeeding is often accompanied by deficiencies in minerals and trace elements. In dried forage, levels of vitamin A, vitamin E, selenium, and cobalt drop dramatically.
Selenium and vitamin E deficiency can directly cause white muscle disease in lambs, characterized by degeneration and necrosis of cardiac and skeletal muscles. In adult sheep, such deficiencies lead to brittle wool, hoof cracks, and abnormal pica behavior.
Although less visible than acute infections, these “hidden hunger” deficiencies silently erode flock productivity and genetic potential over time.
Winter flock management is fundamentally an accounting system of energy intake versus expenditure. Every disease triggered by underfeeding represents the body’s desperate response to resource scarcity.
In today’s climate variability, establishing a scientifically driven nutritional support system has become essential for large-scale sheep operations. From balancing rumen microbiota, optimizing late-pregnancy nutrition, to adopting advanced systems like the HydroFodder Livestock Feeding Solution, each intervention reduces medical costs and mortality risks.
Ensuring that sheep maintain strong body condition and immunity through winter is not only an ethical responsibility—it is a necessary step toward intelligent, precision-based livestock farming.
With automated hydroponic forage systems addressing winter feed shortages, farmers are no longer constrained by seasonal limitations, but instead can fully control the rhythm of production themselves.
