Dietary sources of carbohydrates, animals weight mManagement.
Glucose is an essential metabolic component for all animals. This necessity may be fulfilled via endogenous synthesis or by consuming dietary sources of carbohydrates. Propionic acid, lactic acid, glycerol, and specific amino acids are utilized by gluconeogenic pathways in the liver and kidneys to produce glucose, which is then transported to the tissues of the body via the circulation.
Gluconeogenic pathways enable the dog to fulfill its metabolic need for glucose during both growth and mature maintenance, on the condition that an adequate amount of fat and protein are incorporated into the diet. Nevertheless, there has been ongoing debate regarding the necessity of an exogenous carbohydrate source during the metabolically demanding stages of gestation and lactation.
Because glucose is a primary source of energy for fetal development, the female dog's nutritional requirements increase during pregnancy. In a similar fashion, additional glucose is required for the synthesis of lactose, the disaccharide found in breast milk, during lactation. It is postulated that the female cat experiences an augmentation in glucose demand throughout these physiological phases as well.
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An initial investigation involving canines assessed the extent of reproductive achievement in females reared on diets containing different proportions of carbohydrates. According to the data, pregnant canines did in fact need a carbohydrate source in order to help and raise healthy offspring. Near the conclusion of their pregnancies, canines that had been fed a diet devoid of carbohydrates during gestation developed hypoglycemia, ketosis, and decreased blood concentrations of the amino acid alanine. A mere 63% of the litter produced surviving pups at birth, and the mortality rate for puppies was significantly elevated in the immediate postnatal period.
Subsequently, data from a second study that also investigated the effects of a carbohydrate-free diet during gestation and lactation in female canines refuted these findings. The results of this study suggested that the absence of carbohydrates in the diet had no significant impact on the viability of puppies, litter size, or weight.
In the end, the variation in outcomes between the two investigations was ascribed to disparities in the protein content of the dietary regimens utilized. In contrast to the second series of experiments, which utilized diets containing 51% and 45% protein, the initial study's diet contained only 26% protein.
Administering a diet rich in protein offers adequate quantities of gluconeogenic amino acids, which are essential for sustaining plasma glucose levels throughout the rigorous metabolic processes of pregnancy and lactation. It seems that serine, alanine, and glycine are the primary gluconeogenic amino acids in canines. The canines' decreased alanine levels in the blood during the initial investigation indicate that there was an inadequate supply of alanine to facilitate proper gluconeogenesis.
The hypoglycemia that was noted in these canines was most likely due to insufficient gluconeogenic precursors, not an inherent incapability to produce adequate glucose throughout gestation and lactation. A study investigating the effect of varying levels of dietary protein on the amelioration of the adverse effects of carbohydrate-free diets during pregnancy and lactation provided additional support for these findings. These results confirmed that pregnant and nursing canines can experience adverse effects when fed carbohydrate-free diets. Nonetheless, optimal performance was not compromised in the presence of an adequate protein intake.
Based on the investigators' estimation, female canines necessitate approximately 7 grams of digestible crude protein per unit of metabolic body weight when carbohydrates are included in their diet. In the absence of carbohydrates in the diet, however, this protein requirement must be increased to around 12 grams.
It appears that lactating females require 30 g of protein per unit of metabolic weight when given a carbohydrate-containing diet, compared to 13 to 18 g when fed a diet devoid of carbohydrates. Based on the provided data, it can be concluded that while glucose is a crucial nutrient for the dog's metabolism, carbohydrates are not an essential element of its diet, even during the most metabolically demanding phases of pregnancy and lactation. While specific research on the cat during pregnancy and lactation is lacking, the carnivorous nature of this species and its distinctive gluconeogenesis pattern suggest that it may undergo such changes.