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A ewe's nutritional requirements are highest during lactation, especially if the ewe is nursing multiple offspring. Ewes with twins produce 20 to 40 percent more milk than those nursing twins.
(http://www.sheep101.info/201/nutritionreq.html)

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Farmers feed pigs a high-quality, grain-based diet consisting mainly of crops such as barley, wheat and corn, which provide pigs with energy, and soybeans and canola meal for protein. Farmers add vitamins and minerals to the feed of newly-weaned pigs for optimum nutrition.

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Pigs are omnivores, which means that they consume both plants and animals. In the wild, they are foraging animals, primarily eating leaves, roots, fruits, and flowers, in addition to some insects and fish. As livestock, pigs are fed mostly corn and soybean meal with a mixture of vitamins and minerals added to the diet.

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Sharon Torrance

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Increasing certain vitamins and minerals can poorly affect the young by "overdosing" them by the end of the third pregnancy stage. (late in the pregnancy) https://europepmc.org/abstract/med/10692870

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It is common to not adapt a cows dietary intake until the final two months of pregnancy. The uterus takes up more space in the body, causing the animal’s voluntary intake to decrease. During lactation, cows also tend to have less of a desire to eat, particularly right after giving birth. Their abdomen is still swollen inside and the rumen will take a few days to adjust to its former size after calving.

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Increased absorption of Ca in young growing animals was accompanied by a decreased rate of bone resorption.https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/effect-of-age-and-level-of-dietary-calcium-intake-on-calcium-metabolism-in-sheep/A64BF36260D3AB82206F21E69AD2C7F7

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For ewes, non-lactating and in the first 15 weeks of gestation, little more than maintenance of weight, a gain of 0.07 Ib. daily, is expected, and in the last 6 weeks of gestation the expected gain is 0.37 Ib. daily. Requirements for lactation are given in 2 parts. In the first 8 to 10 weeks a weight loss of 0.08 Ib. per day and a milk yield of 3.0 Ib. per day, produced with a net efficiency of 60 per cent. in terms of digestible energy, are expected. In the last 12 to 14 weeks of lactation a gain of 0.07 Ib. is expected and a 50 per cent. drop of milk production in the second half of lactation is assumed. https://www.cabdirect.org/cabdirect/mobile/abstract/19581401447

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Broiler chickens nutritional requirements are largely based on having constant, fast growth, development of a strong skeletal structure and high quality litter. https://www.forfarmers.co.uk/poultry/broiler/broiler-feed-range.aspx

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Sharon Torrance