Reproduction and growth Flashcards
(90 cards)
Gestation- dogs weight gain
Average 63 days
Healthy weight gain is 15-25% more than prebreeding weight
Weight gain predominantly in last third of gestation
After whelping, should weigh about 5-10% more than pre breeding weight
Energy needs for gestating dogs
Two phases of nutritional needs
0-42 days- feed to maintenance
42 days to parturition- increase energy fed by +10%/week
At parturition, 30% above maintenance for small litters, 50-60% above maintenance for larger litters
Gestation-cats
Average 63-65 days
Weight increases steady from conception to parturition
Weight stored as energy (fat) to support lactation
Mean weight gain in queens
is 40% of pre-breeding weight
Lose 40% of thai at parturition
Remaining 60% sustains milk production
Energy needs of queens
Single phase requiring increase in energy intake
Increase energy fed by 10%/week starting from conception
At parturition, 140-150% above maintenance energy needs
Energy density of food often limiting factor
Lactation-dogs
Energy requirement steadily increases post whelping
Peaks between 3-5 weeks; 2-4x higher than maintenance
Returns to maintenance about 8 weeks post whelping
Energy needs for lactating dogs
Energy requirements divided into maintenance energy and energy for milk production
Based on body weight, week of lactation, and number of puppies in litter
one way to calculate DER for lactating dogs
DER for lactating bitches is higher than other adults (even without taking into consideration milk production) due to the stress and increased activity of caring for puppies
DER = 145 x BWkg^0.75
DER = 145 x 20kg^0.75
DER = 1378 kcal
How to calulate ME for lactating dogs
L= week of lactation
n and m based on number of puppies
EL=BWkgx (24n + 12m) x L
E3= 20kg x (24(4) + 12(1)) x 1.1
E3= 20kg x (96 +12) x 1.1
E3= 20kg x 108 x 1.1
E3= 2376 kcal
ME = DER + EL
ME = 1378 + 2376
ME = 3754 kcal
L for week 1 of lactation
0.75
L for week 2 of lactation
0.95
L for week 3 of lactating dogs
1.1
L for week 4 of lactation
1.2
Second method of calculating ME for lactting dogs
Considers litter size but does not take into consideration which week of lactation
DER = 2.1 x 70(BWkg^0.75)
DER = 2.1 x 70(20kg^0.75)
DER = 1390 kcal
EL= + 25% DER/puppy
EL= 1390(0.25) x 5 puppies
EL= 348 kcal x 6
EL= 1740 kcal
ME = 1390 + 1740
ME = 3130 kcal
Third method of calculating ME for lactating dogs
Takes into consideration changes in energy needs throughout different weeks of gestation but not litter size
RER = 70 x BWkg^0.75
RER = 70 x 20^0.75
RER = 662 kcal
MER = 1.8 x 662
MER = 1192 kcal
Lactation week 1: 150-200% MER
Lactation week 2-5: 200-300% MER
Lactation 6 to weaning: gradual decrease to 150% MER
ME3= MER x 220%
ME3= 1192 x 2.2
ME3= 2622 kcal
What is the best way to feed lactating dogs
Due to the high energy requirements, free-choice feeding often recommended during lactation
Energy density of food often a limited factor
Lactation-cats
Most energy-demanding stage of a cat’s life
Peak milk production occurs at 3-4 weeks of lactation
Energy intake continues to increase; however does take into consideration the energy requirement of both queen and kittens
Weight and energy intake of queen returns to normal by weaning
Energy needs for lactating cats
Feed energy dense food to meet needs without overwhelming stomach capacity
Free choice feeding to allow for variation in energy needs
Protein for gestation and lactation
Protein requirements increase during gestation and lactation
Consider digestibility and amino-acid profiles as well as amount
Inadequate protein during lactation and gestation can result in
Lower birth weights
Higher neonatal mortality
Impaired immune systems
Poor lactation
Poor growth
Fats and fatty acids for gestation and lactation
Increased fat intake during gestation (last trimester in dogs) could result in increased fat content in milk by up to 30%
Allows for high caloric density required for queens and bitches (more than twice the calories of protein and carbohydrates)
Arachidonic acid essential for cats
Arachidonic acid essential for cats becasue
Fetal brain development
Gestation & reproductive success
Viability of kittens
DHA is and important during gestation and lactation because
Docosahexaenoic acid (omega 3 fatty acid)
Supports retinal and auditory development
Important in brain development
Milk concentrations parallel food intake
Now recognized by AAFCO as an essential nutrient for growth
Carbohydrates in gestation and lactation
No true carbohydrate requirement during gestation and lactation
However digestible carbohydrates:
Protect against weight loss during pregnancy
Increases birth weight and neonatal survival
Improves lactation performance