question: how can strictly vegetarian animals go from only drinking milk as babies to only eating grass? Like how would their digestive systems completely change from only thriving off an animal byproduct to only eating grass?
comment: Because they dont just switch overnight. Any mammal who drinks milk as a baby is slowly introduced to other foods over time. That’s why it’s called weaning. They still drink milk, just less and less. Eventually they stop drinking their mothers milk and eat strictly whatever else that species eats.
passages: The degree of vegetarianism varies depending on environment. In Mexico, "B. kiplingi" inhabit more than 50% of "Vachellia collinsii" trees and feed almost exclusively on a herbivorous diet. In Costa Rica, the "B. kiplingi" population inhabit less than 5% of Acacia trees and their diet is less herbivorous. Although this species is mostly territorial and forages solitarily, populations of several hundred specimens have been found on individual acacias in Mexico, with more than twice as many females as males. "B. kiplingi" appears to breed throughout the year. Observations of adult females guarding hatchlings and clutches suggest that the species is quasisocial.
   A study made in Mkhuze Game Reserve and Ndumu Game Reserve in Natal, focused on the dietary habits of the impala and the nyala, showed that the amount of dicotyledons in their diets varied seasonally. In the diet of nyala its content was 83.2% and impala's diet contained a lesser figure of 52% dicotyledons. The diet grew richer in fiber content and dietary proteins were less. The reverse occurred in the rainy season. As the rainy season arrived, both the species took to a diet of mainly monocotyledons, and the impala consumed more of them. The diet contained more proteins than fibers.
   Young elephants, pandas, koalas, and hippos eat the faeces of their mother, probably to obtain the bacteria required to properly digest vegetation. When they are born, their intestines do not contain these bacteria (they are completely sterile). Without them, they would be unable to get any nutritional value from many plant components.
  
  Section::::Digestive system.:In earthworms.
   Processing is an important determinant of what nutrients a dog is actually able to digest and absorb. Plant-based ingredients can be very difficult to break down without proper enzymes in the animal’s digestive tract to do this. Processing has the ability to break down nutrients such as insoluble fiber and protein that can aid in the digestibility of the ingredients and ensure the dog is utilizing the nutrients given to meet its requirements. However, processing can cause negative effects to these traits as well.
  
  Section::::Processing.:Processing of kibble – extrusion process.
   Section::::Ecology and behaviour.:Diet.
  
  Robichaud offered spleenwort ("Asplenium") fern species, broad dark-green plants of the genus "Homalomena", and various species of broad-leaved shrubs or trees of the subfamily Sterculiaceae to the captive animal. The saola fed on all plants, and showed a preference for the Sterculiaceae species. She did not pull at leaves, she would rather chew or pull them into her mouth using her long tongue. She fed occurred mainly during the day, and rarely in the dark. The saola is also reputed to feed on "Schismatoglottis", unlike other herbivores in its range.
  
  Section::::Ecology and behaviour.:Reproduction.
   The digestive physiology of a very young kid (like the young of other ruminants) is essentially the same as that of a monogastric animal. Milk digestion begins in the abomasum, the milk having bypassed the rumen via closure of the reticuloesophageal groove during suckling. At birth, the rumen is undeveloped, but as the kid begins to consume solid feed, the rumen soon increases in size and in its capacity to absorb nutrients.
   The young of elephants, giant pandas, koalas and hippos eat the feces of their mothers or other animals in the herd, in order to obtain the bacteria required to properly digest vegetation found in their ecosystems. When such animals are born, their intestines are sterile and do not contain these bacteria. Without doing this they would be unable to obtain any nutritional value from plants.
   Section::::Health effects.:Nutrition.:Calcium.
  
  Calcium intake in vegetarians and vegans can be similar to non-vegetarians, as long as the diet is properly planned. Lacto-ovo vegetarians that include dairy products can still obtain calcium from dairy sources like milk, yogurt, and cheese.
   "Milk-fed" veal calves consume a diet consisting of milk replacer, formulated with mostly milk-based proteins and added vitamins and minerals supplemented with solid feeds. This type of diet is similar to infant formula and is also one of the most common diets used for calves in the veal industry.
  
  "Grain-fed" calves normally consume a diet of milk replacer for the first six to eight weeks and then move on to a mostly corn-based diet. 
   Organisms are dependent on food dependence in nature, the energy of this sun operated by the vegetation is not only useful in the development of plants and trees, but the Sahay Jagi Jagat fulfills their energy needs; trees depend on the plants for the needs and thus the predators vegetarian life is to build a series that we have food chain says a Paristhit In many cases, many food chains produce a complex diet trap, different levels of energy transfer can also be understood by energy or food pyramid, and this is shown in a model.
  
  Section::::Dead Eating and Decomposing.
   The School of Public Health at Loma Linda University has conducted three cohort studies that identify the health benefits of a vegetarian diet. The University is a Seventh-day Adventist health science institution. The first study, funded by the US Public Health Service in 1958 and limited to Adventists in California, included many vegetarians. The next cohort of California Adventists, the "Adventist Health Study-1" (AHS-1), collected data from 1974 to 1976. Then, from 2002 to 2007, the "Adventist Health Study-2" (AHS-2) collected dietary data from 96,000 church members from the United States and Canada. Many scientific articles have been published on the health and nutrition properties of a vegetarian diet from these cohort studies. The most recent AHS-2 study includes findings on metabolic syndrome, Vitamin D absorption, and type-2 diabetes.
   Section::::Processing.:Nutritional aspects of processing.:Fiber.
  
  Processing increases water solubility of fiber by reducing the molecular weight of starch molecules like hemicellulose and pectin. This conversion of insoluble to soluble fiber increases the total dietary soluble fiber amounts in the feed mixture by making fiber more susceptible to absorption.
  
  Section::::Processing.:Nutritional aspects of processing.:Lipids.
   Section::::Vegetarian Research.
  
  The Department of Nutrition at Loma Linda University has dedicated extensive research to examining the nutrition and health effects of plant foods and plant based diet patterns. Research also includes assessing the safety, adequacy and optimacy of vegetarian eating patterns as well as assessing the potential impact of animal vs plant foods on nutrition, microbial contamination and sanitary concerns, and on the environment.
   It was once thought that plant sources of protein are deficient in one or more amino acids, and so vegetarian diets had to specifically combine foods during meals, which would create a complete protein. However, the most recent position of the Academy of Nutrition and Dietetics is that protein from a variety of plant foods eaten during the course of a day typically supplies enough essential amino acids when caloric requirements are met. Normal physiological functioning of the body is possible if one obtains enough protein and sufficient amounts of each amino acid from a plant-based diet. In fact, the highest PDCAAS scores are not given to commonly eaten meat products, but rather to animal-derived vegetarian foods like milk and eggs and the vegan food soy protein isolate.
   Section::::Alternative sourcing of ingredients.
  
  Due to the exclusion of animal products and by-products which are the primary ingredients of conventional dog food, many nutrients that would otherwise be provided by animal products need to be provided by replacement, plant-based ingredients. While both animal and plant products offer a wide range of macro and micronutrients, strategic formulation of plant ingredients should be considered to meet nutritional requirements as different nutrients are more abundant in different plant sources.
  
  Section::::Alternative sourcing of ingredients.:Primary protein.
   Section::::Behavior.:Diet.
  
  The pudús are herbivorous, consuming vines, leaves from low trees, shrubs, succulent sprouts, herbs, ferns, blossoms, buds, tree bark, and fallen fruit. They can survive without drinking water for long periods due to the high water content of the succulent foliage in their diets.
   Section::::Alternative sourcing of ingredients.:Calcium.
  
  Calcium is a micronutrient that is essential for the proper mineralization of bones, teeth, and intracellular signalling. The amount of calcium required by an animal is related to many other nutrients such as phosphorus intake, as it is important to balance calcium and phosphorus levels at a ratio of 1.2–1.4:1. Protein intake is also a factor, as increased consumption of protein leads to more calcium being excreted in the urine to balance out the nitrogenous waste products of the amino acid metabolism.
   While there is little evidence of adverse health or cognitive effects due to DHA deficiency in adult vegetarians or vegans, fetal and breast milk levels remain a concern. EPA and DHA supplementation has been shown to reduce platelet aggregation in vegetarians, but a direct link to cardiovascular morbidity and mortality, which is already lower for vegetarians, has yet to be determined.
  
  Section::::Nutritional deficiencies.:Calcium.
  
  It is recommended that vegans eat three servings per day of a high-calcium food, such as fortified plant milks, green leafy vegetables, seeds, tofu, or other calcium-rich foods, and take a calcium supplement as necessary.
   A potential problem is that vegetarian diets lacking eggs or generous amounts of edible seaweed generally lack a direct source of long-chain O3FAs such as eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA). Vegetarian diets may also have a high ratio of omega-6 fatty acids to O3FAs, which inhibits the conversion of short-chain fatty acids such as alpha-Linolenic acid (ALA), which is found in most vegetarian O3FA sources, to EPA and DHA. Short-term supplemental ALA has been shown to increase EPA levels but not DHA levels, suggesting poor conversion of the intermediary EPA to DHA. To remedy this, DHA and EPA supplements derived from microalgae are available.
   Some systems of veal production rear calves that are denied access to any solid feed and are fed a liquid milk replacer. They may also be deprived of bedding to prevent them from eating it. This dietary restriction completely distorts the normal development of the rumen and predisposes the calf to infectious enteritis (scouring or diarrhea) and chronic indigestion. Furthermore, calves with an underdeveloped gut are more likely to be found to have hairballs in the rumen at slaughter; the accumulation of hairballs in the rumen can impair digestion. Veal calves raised in the US are fed a nutritionally balanced diet of milk replacer and in most cases are fed a solid feed to promote healthy gut development. 
   Section::::Husbandry.:Feeding.
  
  Animals used as livestock are predominantly herbivorous, the main exception being the pig which is an omnivore. The herbivores can be divided into "concentrate selectors" which selectively feed on seeds, fruits and highly nutritious young foliage, "grazers" which mainly feed on grass, and "intermediate feeders" which choose their diet from the whole range of available plant material. Cattle, sheep, goats, deer and antelopes are ruminants; they digest food in two steps, chewing and swallowing in the normal way, and then regurgitating the semidigested cud to chew it again and thus extract the maximum possible food value.
   In 2018, Faunalytics conducted an exploratory study of attitudinal and behavioral differences among people in the “BRIC” countries – Brazil, Russia, India, and China – plus the United States. Data for this study were collected by YouGov in May and June of 2018, from more than 1,000 individuals per country. They found that more people are reducing than increasing their meat consumption, but that despite wanting better welfare for farmed animals most people don’t believe meat-eating is to blame for animal suffering.
  
  Section::::Animal Charity Evaluators Review.
   Section::::Pottenger's cats.:Meat study.
  
  In one study, one group of cats was fed a diet of two-thirds raw meat, one-third raw milk, and cod-liver oil while the second group was fed a diet of two-thirds cooked meat, one-third raw milk, and cod-liver oil. The cats fed the all-raw diet were healthy while the cats fed the cooked meat diet developed various health problems. 
  
  BULLET::::- By the end of the first generation the cats started to develop degenerative diseases and became quite lazy.
   Section::::Nutritional deficiencies.:Iron.
  
  In several studies, vegetarians were not found to suffer from iron (Fe) deficiency more than those who ate meat. However, while one study agreed that iron-deficiency anemia is not more common among vegetarians, they found "vegetarian children had ... reduced levels of haemoglobin and iron compared to omnivores" due "to the absence of animal iron sources with high utilizability". Another study done in India found that "strict vegetarian mothers as well as their newborns have a greater incidence and risk of anemia and iron deficiency."
   Section::::Processing.:Nutritional aspects of processing.
  
  Processing has both beneficial and detrimental effects on feed ingredients as it applies high levels of heat, and with extrusion, pressure with reduction of moisture content.
  
  Section::::Processing.:Nutritional aspects of processing.:Protein.
  
presuppositions: The digestive system changes rapidly to accommodate a new food source.
corrections: The digestive system changes slowly to accommodate a new food source.
raw_presuppositions: The digestive system changes rapidly to accommodate a new food source. The digestive system changes rapidly to accommodate a new food source.
raw_corrections: The digestive system changes slowly to accommodate a new food source. The digestive system changes slowly to accommodate a new food source.