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Showing 1 to 14 of 14 for “"pullets"”.
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Cost of raising pullets on representative Michigan farms
Thesis (M.S.)--Michigan State College of Agriculture and Applied Science. Dept. of Poultry Husbandry, 1955
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Correlation Between the Egg Laying Ability of Pullets and Certain Hormonally Controlled Characteristics of Their Full Brothers
Made available in DSpace on 2014-12-05T17:47:19Z (GMT). No. of bitstreams: 1 0009119.pdf: 3621882 bytes, checksum: 0d06ae65e49a0affd5769d62b7572f6b (MD5) Previous issue date: 1952
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Agonistic behavior, the development of the social hierarchy and stress in genetically diverse flocks of chickens
… development of the social hierarchy of juvenile pullets were studied in two lines of chickens which had been divergently selected for juvenile body weight and in which the dwarf gene (dw) was segregating. Correlations between the behavioral measurements and physiological variables were computed …
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The influence of reverse protein feeding on pullet growth and subsequent laying performance in the white leghorn
Day old Dekalb XL-link pullets were randomly assigned to eight dietary treatments of 100 birds each. The percent crude protein (CP) with the respective weeks fed in parentheses for each treatment (T) was as follows: T1. control 18(0-6), 15(6-14) and 12(14-20); T2. 18(0-1), 12(1-8), 15(8-14) and …
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The Effects of a Single Strain Bacillus subtilis DFM on pullet performance, laying hen performance, and egg quality when fed from day of hatch until 70 weeks
… of age. In total, 576 Hy-Line W-36 laying hen pullets were randomly divided between two treatments (Control and DFM) on day of hatch across 12 cages for each of the treatments and maintained on those respective treatments for 70-weeks. The DFM was added at a target dose of 300,000 cfu/kg of …
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A genetic analysis of reproduction in growth selected lines of chickens
… utilizing S₁₅, S₁₆(R₃) and S₁₇(R₄) generation pullets from lines selected for high (HW) and low (LW) 8-week body weight. HW pullets laid significantly more defective eggs than LW pullets at each of the physiological ages measured from the date of first egg to 160 days of lay. Also, the pattern …
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The Effect of Selection on Egg Production in Single Comb White Leghorn Fowl
… was no important in the egg laying ability of pullets sent to the storrs Egg-Laying Contest over a period of 9 years. These pullets were produced by 192 breeders in different parts of the United States. Such finding indicate that the breeding system generally employed by poultrymen are not …
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The Acute and Chronic Effects of a Cyclic Heat Stress on 24 to 28 Week Old Laying Hens on Performance, Egg Quality, Apparent Metabolizable Energy, and Blood Chemistry
… time points. In total, 407 pure line laying hen pullets (18 wk) were sourced from Hy-Line International and housed individually for the duration of the experiment. Feed intake, egg production, and body weights were significantly decreased while egg weight and feed efficiency increased due to HS …
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Acoustical analyses of chicken vocalizations
… showed low frequencies of pecks and threats. Pullets from stock B had significantly more pushes and steps than those from stock A. The vocalizations emitted by stock B exhibited an increased range of frequencies in comparison to those by stock A. This difference was attributed to an increased …
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Gene action involved with reproduction and growth of brain and muscle in weight-selected lines of chickens
… ages (Experiment 3). Reduced egg size of dwarf pullets did not reduce embryonic weights. Embryo length and weight and yolk sac weight were greater for line HH than LL. In Experiment 4, allometric growth and cellular content of brains were measured in normal and dwarf chickens from lines HH and …
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Effect of amino acids and vitamin D3 on performance and biological responses in poultry
… eggshell quality and bone health in laying hens. Pullets/hens were randomly assigned to five dietary treatments containing vitamin D3 from 1,681 to 68,348 IU/kg diet from day of hatch until 68 weeks of age. These data suggested that dietary vitamin D3 fed at 68,348 IU/kg resulted in reduced egg …
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Genetic analyses of growth, sexual maturation, and ova production in chickens
… greater differences between mature and immature pullets for the former than for the latter traits. The exception to this pattern was the line selected for low juvenile body weight where adiposity traits appeared to be primary.
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Alternate Housing for Laying Hens
… in a commercial operation. Shaver White Leghorn pullets were housed in one of four housing treatments, alternate cages without a dustbath (NDB), alternate cages with a dustbath (DB), battery cages with three birds per cage (465 cm2/bird) (D3) and battery cages with two birds per cage (697 …
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Understanding the development of gut microbiota and effect of Salmonella Typhimurium infection on gut microbiota in layers
… shedding and gut microbiota composition in pullets. The study showed persistent shedding of Salmonella Typhimurium in all the infected birds for up to week 8 postinfection. The Salmonella Typhimurium shedding increased significantly due to intramuscular injections and feed withdrawal. The …